Make shapes by joining two polygons in different ways

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)

Two triangles have been joined to make new polygons.
Which new shape is not a quadrilateral?

Complete the sentence.
Lines are parallel when __________

A rectangle is a quadrilateral. What are the properties of a rectangle?

Look carefully at this polygon. Which statements are true?

True or false. These shapes are all rectangles.

Which of these quadrilaterals does not have any parallel sides?

A __________ is a 2D shape made up of three or more straight lines.

Which of these statements are true for all quadrilaterals?

Which of these shapes are quadrilaterals?

Which of these describe the  properties of all triangles?

A four-sided shape with 4 right angles and 4 equal sides.

Match the description to the type of shape. 

This lesson will soon be taken down.

Make shapes by joining two polygons in different ways

Lesson outcome