Foundation Mathematics Primary 6 Angles

In a regular pentagon ABCDE, all five sides are equal and all five interior angles are equal. Find the size of one interior angle.

A 120°
B 144°
C 108°
D 72°
Show Worked Solution

Worked Solution

Step 1: For a regular n-sided polygon, each interior angle = (n − 2) × 180° / n. Step 2: For pentagon (n = 5): (5 − 2) × 180° / 5 = 540° / 5 = 108°. Answer: 108°

Correct answer: 108°

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