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# Geometry: FAQ

Frequently asked questions about geometry

## What are angle relationships, parallel lines, and transversals?

When two lines intersect, they form angles with each other. Different types of angles have different relationships to one another. For example, vertical angles always have equal measures, while supplementary angles have measures that add up to $180$ degrees.

Parallel lines are lines that never intersect. A transversal is a line that crosses two or more lines, and it can create interesting relationships between the angles formed.

## What do we know about triangle angles?

The sum of the measures of the three interior angles in a triangle is always $180$ degrees. So, if we know two of the angle measures, we can use that information to find the measure of the third angle.

## What is the Pythagorean theorem?

The Pythagorean theorem states that in a right triangle, the square of the hypotenuse is equal to the sum of the squares of the two other sides. It's often written as the equation ${a}^{2}+{b}^{2}={c}^{2}$ .

## How can we use the Pythagorean theorem to find the distance between two points?

We can draw a right triangle between the two points, and then use the Pythagorean theorem to find the hypotenuse, which is the distance we're looking for.

## Why do we need to know about volume?

Volume is a measure of the amount of space an object takes up. It's important for both practical and theoretical reasons. For example, if we're building a container to hold a certain amount of liquid, we need to know how to calculate the volume so we can make sure the container is big enough.

## Where are these topics used in the real world?

Many of the topics in this unit have a wide range of applications. For example, the Pythagorean theorem is used in fields like architecture, construction, and surveying. Understanding angles is important for everything from drafting to robotics. And knowing how to calculate volume is crucial in a number of industries, from manufacturing to food and beverage.

## Want to join the conversation?

- is there an easier way to explain this for new learners? Many of the words have not been explained.(20 votes)
- My advice is to watch the videos in this unit. They go further in detail.(12 votes)

- I like the fact that you get a reminder for this stuff, but the Pythagorean theorem is my favourite and all other shapes I am a fan of math.(11 votes)
- but will you use it in real life?(1 vote)

- You can write the formula's down on a piece of papper.(8 votes)
- The volume of cylinders, spheres, and cones word problems was pretty hard for me. Anyone else had trouble with that too?(7 votes)
- kjjj roejeje nioe ieopin r.(5 votes)
- the answer to your question is on google translate(3 votes)

- when you already know most of the topics I just go wow this is really easy!(6 votes)
- Do you guys think geometry is useless?(2 votes)
- Geometry is far from useless. It can improve multiple aspects: Practical Applications, Problem-Solving skills, Everyday Life, Academic foundations and historical and cultural significance.(8 votes)

- why do wwe do "1.333" instead of "1.3 "(3 votes)
- I'm not sure where you saw 1.333 but Sal may have just been explaining repeating decimals and he decided to write it out. 1.3 repeating is the same as the fraction 4/3.(6 votes)

- i just need more help on spheres and cones(5 votes)
- ask me any question(2 votes)