An angle is a measure of turn. It shows how far something has rotated. It is often displayed as the rotation between two line segments.

A point is an exact location. It has no size, only position.

A vertex is a point where two or more lines meet.

A scale is a number line with equal divisions for equal values.

Measure the size of angles accurately using a protractor

Maths

Review understanding and identification of right angles

Review understanding of angles as a measure of turn

Use the terms acute, obtuse and reflex when comparing angles to a right angle

Use the unit of degrees as a standard unit to measure angles

Describe static angles using the standard unit of degrees when compared to a right angle

Describe rotations using the standard unit of degrees when compared to a right angle

Estimate acute and obtuse angles using the standard unit of degrees

Know that the angles in a full turn sum to 360 degrees and use this to solve problems

Know that the angles at a point sum to 360 degrees and use this to solve problems

Angles in quadrilaterals

Know that the angles on a straight line sum to 180 degrees and use this to solve problems

Angles in triangles

Draw angles accurately using a protractor

Reasoning about angles in polygons

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.

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

Which image shows the protractor placed correctly to measure the angle?

Read the protractor scale to measure the angle. {{ }}°

Guess the size of a based on the angle of 115°

Sofia measured the obtuse angle in order to find the missing angle a. What is her next step?

Jun measured the acute angle in order to find the missing angle a. Tick what his next steps could be.

A triangle with three equal sides and three equal vertices.

A triangle with two equal sides and two equal vertices.

A triangle with no equal sides or vertices.

Which of these is the best estimate for the angle shown?

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

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

The image is not to scale. Complete the sentence. I estimate that the size of angle a is ___ degrees.

Exit Quiz

Which image shows the protractor placed correctly to measure the angle?