Angles in triangles

Maths

In this unit pupils will compare the size of angles where there is a clear visual difference and use the terms acute, obtuse and reflex when describing the size of angles or amount of rotation with relation to right angles using a unit called degrees. In the future unit pupils will use knowledge of shape properties to draw, sketch and identify shapes.

In the prior unit pupils completed and composed symmetrical shapes from two congruent shapes and investigate lines of symmetry in 2D shapes. In this unit pupils will compare the size of angles where there is a clear visual difference and use the terms acute, obtuse and reflex when describing the size of angles or amount of rotation with relation to right angles using a unit called degrees.

Angles: compare, name, estimate and measure angles

The internal angles in all triangles sum to ___.

Tick the expressions that could represent the angles in a triangle.

Finish the expression so that it could represent the angle sum of a triangle. 60°+ 75° + {{ }}°

The image is not to scale. Calculate missing angle a. A = {{ }}°

Look at the hands on this clock face and the arrow. The angle formed is __________.

This triangle has three equal sides and three equal vertices. Select the correct name for this triangle.

Match the angles to the correct description

The image is not to scale. What is the value of missing angle a? a = {{ }}°

This lesson will soon be taken down.

Angles in triangles

Lesson outcome