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### Course: 7th grade (Eureka Math/EngageNY)ย >ย Unit 6

Lesson 2: Topic B: Constructing triangles

# Construct a right isosceles triangle

Can you build a triangle that is both a right triangle and an isosceles triangle? Created by Sal Khan.

## Want to join the conversation?

• unique triangle.. what about reflected triangles? they would have the same lengths!
• That would be the same triangle. The question is asking, can you make another triangle that has at least one different angle or side length.
• If you had a quadrilateral for which you knew all 4 sides, have you uniquely determined it? Are there other quadrilaterals with the same 4 sides but different angles?
• Nice question and the answer is that there can be other quadrilaterals with same side lengths but different angles. For example, both squares and rhombi have equal side lengths for all 4 sides, but a square is restricted to only have right angles while a rhombus is not.
• Turn the volume up ๐
• I am having a lot of trouble on this topic... could you please add maybe another problem in this video?
• you can use a pro tracker to measure the angles,,,thats what i use
(1 vote)
• How do i make a right triangle wth sides 5,8,and 10
• unique triangle.. what about reflected triangles? they would have the same lengths!
• Bro just copied a person that wrote the EXACT same thing 10 years ago๐๐
(1 vote)
• Can someone explain me one a few things here because I didn't really understand much. like what if you need to make a 80 degree triangle with a 9 inch side? how am I supposed to find out if it even can be made or if its not a unique triangle? I'm bad at making triangles for math so I need some help to figure out how to know. I feel like this is a stupid question. (T-T)
• If it is a right isosceles triangle, you would first make the 90 degree angle. Then you would drag the other two points until the side across from the 90 degree angle is 9 inches and the other two sides are equal.
If you are making an isosceles triangle with just a 80 degree corner and no 90, then you would first make the 9 inch side, then drag the corner across from it until it is 80 degrees, then make the last two sides of the triangle equal.
Hope this helps!
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