A vertex (vertices is the plural of vertex) is a point where the sides of a shape intersect. So basically any corner on a shape is a vertex.

how do i find surface area

You find the area of each side of the object and then add them all together.

Would a shape with an octagon for a base and triangles for sides meeting at a point be called an octagonal pyramid?

Yes,an octagonal pyramid is a pyramid with a base that's a polygon with eight sides, or an octagon, and triangular faces, or sides, that meet at a point directly above the bottom.

The Rectangular prism is also called a Cuboid. True or False?

That is true. A rectangular prism is also called a cuboid. A cuboid is a three-dimensional shape that has six faces, all of which are rectangles. A cuboid is also a right prism, which means that its bases are parallel and congruent, and its lateral faces are perpendicular to the bases. A cube is a special case of a cuboid, where all the faces are squares. However, not all rectangular prisms are cuboids. A rectangular prism can also be oblique, which means that its bases are not aligned one directly above the other, and its lateral faces are parallelograms2

A sphere is a circle right?

It may seem that way, but technically, a sphere is a 3-D shape (has width, height, and depth) and a circle is 2-D (width and height) A circle is missing the depth needed to become a 3-D shape. Also, you find volume for spheres and area for circles. This then changes the formulas. Circle: A = pi*r^2 Sphere: V = 4/3*pi*r^3 Good luck in your journey through geometry!

What kind of polygon have 100 sides ?

Think of a century as 100 years, so it would be a centagon. This is like a decagon is like a decade (10 years).

what the differences between vertices and edges?

A vertex is where two or more edges meet, so a vertex is a point and a edge is a line segment.

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Class 8 (Old)

Course: Class 8 (Old) > Unit 14

Lesson 1: Faces, edges, and vertices

Recognizing common 3D shapes

Name: Recognizing common 3D shapes
Uploaded: 2017-05-30T15:28:56Z
Description: Learn about 3D shapes! A square pyramid has a square base. A rectangular prism is a box shape with all rectangular sides. A triangular prism has triangle faces on opposite sides. A sphere is like a globe. A cylinder looks like a can with circular faces on top and bottom. Shapes are fun!

Google Classroom

Learn about 3D shapes! A square pyramid has a square base. A rectangular prism is a box shape with all rectangular sides. A triangular prism has triangle faces on opposite sides. A sphere is like a globe. A cylinder looks like a can with circular faces on top and bottom. Shapes are fun!

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soyebosofolar
Posted 6 years ago. Direct link to soyebosofolar's post “what is a vertice?”
what is a vertice?
Button navigates to signup pageComment on soyebosofolar's post “what is a vertice?”
(22 votes)
Answer
- J E
  Posted 6 years ago. Direct link to J E's post “A vertex (vertices is the...”
  A vertex (vertices is the plural of vertex) is a point where the sides of a shape intersect. So basically any corner on a shape is a vertex.
  Comment on J E's post “A vertex (vertices is the...”
  (14 votes)
25chancepuskar
Posted 5 years ago. Direct link to 25chancepuskar's post “how do i find surface are...”
how do i find surface area
Button navigates to signup pageComment on 25chancepuskar's post “how do i find surface are...”
(14 votes)
Answer
- Carter Boehler
  Posted 5 years ago. Direct link to Carter Boehler's post “You find the area of each...”
  You find the area of each side of the object and then add them all together.
  Comment on Carter Boehler's post “You find the area of each...”
  (12 votes)
ezras2022
Posted 4 years ago. Direct link to ezras2022's post “Would a shape with an oct...”
Would a shape with an octagon for a base and triangles for sides meeting at a point be called an octagonal pyramid?
Button navigates to signup pageComment on ezras2022's post “Would a shape with an oct...”
(5 votes)
Answer
- Kamesh R
  Posted 4 years ago. Direct link to Kamesh R's post “Yes,an octagonal pyramid ...”
  Yes,an octagonal pyramid is a pyramid with a base that's a polygon with eight sides, or an octagon, and triangular faces, or sides, that meet at a point directly above the bottom.
  Button navigates to signup page
  (6 votes)
Keaton
Posted 3 years ago. Direct link to Keaton's post “A sphere is a circle righ...”
A sphere is a circle right?
Button navigates to signup pageComment on Keaton's post “A sphere is a circle righ...”
(2 votes)
Answer
- BronsonFebruary
  Posted 3 years ago. Direct link to BronsonFebruary's post “It may seem that way, but...”
  It may seem that way, but technically, a sphere is a 3-D shape (has width, height, and depth) and a circle is 2-D (width and height) A circle is missing the depth needed to become a 3-D shape. Also, you find volume for spheres and area for circles. This then changes the formulas.
  Circle: A = pi*r^2
  Sphere: V = 4/3*pi*r^3
  Good luck in your journey through geometry!
  Comment on BronsonFebruary's post “It may seem that way, but...”
  (7 votes)
huy064480
Posted 2 years ago. Direct link to huy064480's post “What kind of polygon have...”
What kind of polygon have 100 sides ?
Button navigates to signup pageComment on huy064480's post “What kind of polygon have...”
(2 votes)
Answer
- David Severin
  Posted 2 years ago. Direct link to David Severin's post “Think of a century as 100...”
  Think of a century as 100 years, so it would be a centagon. This is like a decagon is like a decade (10 years).
  Comment on David Severin's post “Think of a century as 100...”
  (6 votes)
Indra Negi
Posted 5 months ago. Direct link to Indra Negi's post “The Rectangular prism is ...”
The Rectangular prism is also called a Cuboid. True or False?
Button navigates to signup pageComment on Indra Negi's post “The Rectangular prism is ...”
(3 votes)
Answer
- Nama Gosselin
  Posted 4 months ago. Direct link to Nama Gosselin's post “That is true. A rectangul...”
  That is true. A rectangular prism is also called a cuboid. A cuboid is a three-dimensional shape that has six faces, all of which are rectangles. A cuboid is also a right prism, which means that its bases are parallel and congruent, and its lateral faces are perpendicular to the bases. A cube is a special case of a cuboid, where all the faces are squares. However, not all rectangular prisms are cuboids. A rectangular prism can also be oblique, which means that its bases are not aligned one directly above the other, and its lateral faces are parallelograms2
  Comment on Nama Gosselin's post “That is true. A rectangul...”
  (4 votes)
amartya.m.das
Posted 4 years ago. Direct link to amartya.m.das's post “At 1:50, Sal says "This h...”
At
1:50
, Sal says "This has sides that are triangles", doesn't he mean faces?
Button navigates to signup pageComment on amartya.m.das's post “At 1:50, Sal says "This h...”
(2 votes)
Answer
- Tamsberg,Sarah😈🎶😇
  Posted 2 years ago. Direct link to Tamsberg,Sarah😈🎶😇's post “I think he means bases.”
  I think he means bases.
  Comment on Tamsberg,Sarah😈🎶😇's post “I think he means bases.”
  (2 votes)
cmcgr2618
Posted a year ago. Direct link to cmcgr2618's post “It is fun doing stuff lik...”
It is fun doing stuff like this :)
Button navigates to signup pageButton navigates to signup page
(3 votes)
Answer
katherine
Posted 3 years ago. Direct link to katherine's post “I don't know what a verti...”
I don't know what a vertice is
Button navigates to signup pageComment on katherine's post “I don't know what a verti...”
(2 votes)
Answer
an.gonzalez28
Posted 2 years ago. Direct link to an.gonzalez28's post “what the differences betw...”
what the differences between vertices and edges?
Button navigates to signup pageComment on an.gonzalez28's post “what the differences betw...”
(2 votes)
Answer
- David Severin
  Posted 2 years ago. Direct link to David Severin's post “A vertex is where two or ...”
  A vertex is where two or more edges meet, so a vertex is a point and a edge is a line segment.
  Button navigates to signup page
  (2 votes)

Video transcript

- [Teacher] I have five three-dimensional shapes over here. I also have five names for them. What I want you to do is pause this video and think about which of these shapes is a square pyramid. Which of these is a rectangular prism? Which one is a triangular prism? Which one is a sphere and which one is a cylinder? Let's just work through this together. Really, this is just something to know, because some people in various subjects will sometimes throw out these words. First, let's think about which one is the square pyramid. This shape here on the right clearly looks like a pyramid, and the thing that makes it a square pyramid is the idea that its base is a square. Let me see if I can shade this in. So the base of this right over here is a square. That's where the square pyramid comes from. If it's a triangular pyramid, then the base would only have three sides, but this is a square pyramid. So let me... Move this over there. So that is a square pyramid. Alright, let's do the next one. Which one is a rectangular prism? A prism you can view as a three-dimensional object, and since it's saying a rectangular prism, well, the best one here that is rectangular, notice, this shape right here is rectangular on every side, and it's three dimensions. It is a prism, and so this is the rectangular prism. So let's move that over. So that is our rectangular prism. Now, triangular prism. So this one is interesting. If you look at this shape right over here, it has sides that are triangles. You see this up here is a triangle and you see this down here is a triangle, although they're connected by these rectangular sides. This is actually what's called a triangular prism. In a square pyramid, the faces which are triangles all meet at a point. In a triangular prism, you have two opposite-facing sides that are triangles. You'll see all of these in different orientations. Sometimes it'll be resting like this, sometimes it'll be on it's side, but this is a triangular prism. Let me... So that is a triangular prism. And so we have two left. You might be able to figure these out. Which one is a sphere? When I think sphere, I think of a globe. This choice right over here is clearly a sphere. Let me move that over. Let me move it over, okay, so that one is a sphere. Then last but not least, this thing that looks like a can is a cylinder. So let me move that over. So that is a cylinder. And we're all done. So these are just useful names to know for shapes. Cylinder is... You have these two faces that are circular and then they are opposite each other. It's kind of like a triangular prism, but instead of having these hard edges because you have a triangle, you have a base that is a circle and a top that is a circle.