Students learn about the different types of angles and how to measure them to within one degree. As learning progresses they are challenged to measure and draw reflex angles using a 180° protractor.

At the start of the lesson students investigate the perpendicular angles using a clock face. In the main part they learn how to use a 180° protractor to measure acute, obtuse and reflex angles. The end of lesson recaps students learning through a handout.

**Differentiated Learning Objectives**

- All students should be able to measure and draw an acute and obtuse angle to within 2°.
- Most students should be able to measure and draw an acute, obtuse and reflex angle to within 2°.
- Some students should be able to measure and draw an acute, obtuse and reflex angle to within 1°.