To estimate is to find a value that is close enough to the right answer, usually with some thought or calculation involved.

A degree is a unit of measure for angles.

Estimate acute and obtuse angles using the standard unit of degrees

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

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

This is a triangle. Which of these is a good estimate for the angle of the circled vertex?

This is a hexagon. Which of these is a good estimate for the angle of the circled vertex?

This is an example of an acute angle. Which of these is the definition of an acute angle?

Look at the hands on this clock face and the arrow. How does the angle created by the hands compare to a right angle?

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

This is a triangle. Look carefully at the vertices and the angles inside the shape. Complete the sentence. There are {{ }} acute angles in the triangle.

This is a hexagon. Look carefully at the vertices and the angles inside the shape. Complete the sentence. There are {{ }} obtuse angles in the hexagon.

Complete the sentence. This is an example of an {{ }} angle.

This lesson will soon be taken down.

Estimate acute and obtuse angles using the standard unit of degrees

Lesson outcome