Isosceles
A right angle triangle
A right-angle triangle.
A square and a rectangle.
a triangle
Isosceles
a right angle triangle.
Well, honey, that's a right triangle. It's like a regular triangle, but with a sassy little right angle thrown in there to keep things interesting. So, if you're looking for a shape that's all about that right angle life, you've found it.
A right angle triangle
A right angle triangle
A right-angle triangle.
rectangle
A square and a rectangle.
A Triangle~!
a triangle
A rectangle or a square: both have four sides and a right-angle of 90 degrees forming the four corners.
A square or a rectangle.