Isosceles
A right angle triangle
A right-angle triangle.
A square and a rectangle.
a triangle
Isosceles
a right angle triangle.
A right triangle has three sides and one right angle.
A right angle triangle
A right angle triangle
A right-angle triangle.
A square and a rectangle.
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.