Intermediate November 2019 Unit 1 Q13
13. The exterior angle of a regular polygon is 36°.
(a) How many sides does the polygon have? [2]
(b) Calculate the sum of all the interior angles of this regular polygon. [2]
| Scheme | Marks | Comments |
|---|---|---|
| (Number of sides =) \(\dfrac{360}{36}\) | M1 | |
| = 10 | A1 |
| Scheme | Marks | Comments |
|---|---|---|
| (180 – 36) × 10 or equivalent. | M1 | FT ‘their number of sides’ if >2. |
| = 1440(°) | A1 |
Alternative method.
| Scheme | Marks | Comments |
|---|---|---|
| (10 – 2) × 180 or equivalent. | M1 | FT ‘their number of sides’ if >2. |
| = 1440(°) | A1 |