Make and draw triangles on circular geoboards

Maths

In this unit pupils will investigate ways to compose and decompose polygons. They will investigate quadrilaterals with and without parallel and perpendicular sides. In the future unit pupil will learn perimeter as the distance around the edge of a 2D shape. They will learn perimeter is measured in units of length found by counting units and by calculating by adding the side lengths of a 2D shape.

In the prior unit pupils rotated two lines around a fixed point to make different sized angles. They identified vertices. In this unit pupils will investigate ways to compose and decompose polygons. They will investigate quadrilaterals with and without parallel and perpendicular sides.

Parallel and perpendicular sides in polygons (and perimeter)

Complete the sentence. This is a triangle and it has {{ }} vertices.

True or false: Alex has drawn a pair of perpendicular lines on this circular geoboard.

Complete the sentence. This is a triangle and it has {{ }} pair(s) of perpendicular sides.

Select the statements that are true for this polygon drawn on a circular geoboard.

Select the vertices that could be joined to form a right-angled triangle.

Match the shape name to the number of vertices it has.

True or false? These lines are parallel to one another.

Complete the sentence. This polygon has {{ }} pair(s) of parallel sides.

The pentagon has been decomposed into two polygons which have the same name. What is the name of the polygon?

Complete the sentence. A pair of {{ }} sides meet to make a right angle.

This lesson will soon be taken down.

Make and draw triangles on circular geoboards

Lesson outcome