Maths Dictionary · JSS 1, JSS 2
Exterior angle
Simple meaning
The angle between one side of a shape and the next side extended outwards.
Example
The exterior angles of any polygon add up to 360°.
See it
From the Plane Shapes lesson. Try moving things around.
Rectangle · a quadrilateral
- Sides
- 4
- Right angles
- 4
- Parallel pairs
- 2
- Lines of symmetry
- 2
- Regular?
- No
- Angle sum
- 360°
- (4 − 2) × 180° = 360°
Tick marks show equal sides; arrows show parallel sides.