an "irregular pentagon"
A shape with three sides is called a triangle: 3 equal sides = equilateral 2 sides same length = isosceles 1 right angle = right-angled triangle
a right angle triangle.
A right angle triangle
A right triangle has three sides and one right angle.
Ye. It's called a square.
A right angle triangle
A right-angle triangle.
rectangle
A square and a rectangle.
A Triangle~!
a triangle
The sides that form the right angle are called legs. The side opposite the right angle is called the hypotenuse.