The main concept throughout the lesson is the sum of angles on a straight line being equal to 180° and those about a point have a sum of 360°. From this students go on to discover vertically opposite angles and angles about a point.

**Differentiated Learning Objectives**

- All students should understand that a straight line has a sum of 180 degrees.
- Most students should be able to calculate missing angles on a straight line.
- Some students should be able to calculating missing angles about a point.

**IMMEDIATE DOWNLOAD**

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