Geometry: How Many Right Angles?

This activity is about right angles found in simple shapes.

Example

Which of these shapes are quadrilaterals with no right angles.

a	b	c
d	e	f
g	h

Answer

Remember that the corner of a rectangular piece of paper is a right angle.  

Quadrilaterals have four sides.

Triangles have three sides.

So, the quadrilaterals above are shapes a, c, d and e.

The only one of those four quadrilaterals that has right angles is c, which is a rectangle.

This means that a, d and e are the quadrilaterals above that have no right angles.

Let's have a go at some questions now.