The interior and exterior angles add up to 180°. The interior angle is 180° - 72° = 108°. The sum of interior angles is (5 - 2) × 180° = 540°. The interior angle is 540° ÷ 5 = 108°.
The interior and exterior angles add up to 180°. The interior angle is \(180 - 72 = 108^\circ\). The sum of interior angles is \((5 - 2) \times 180 = 540^\circ\). The interior angle is \(540 \div ...
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