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Question
State the name of a regular polygon of 3 sides.
Solution
A polygon that has equal sides and equal angles is called a regular polygon.
Equilateral triangle:
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Examine the table. (Each figure is divided into triangles and the sum of the angles deduced from that.)
| Figure |  |
 |
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| Side | 3 | 4 | 5 | 6 |
| Angle sum | 180° |
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3 × 180° = (5 − 2) × 180° |
4 × 180° = (6 − 2) × 180° |
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