Question

find the area of a regular pentagon whose each side is 10 cm long and the radius of whose circumscribed circle is 8.5 cm​

Answer 1

Answer:

Step-by-step explanation:

Area of the pentagon = {n/2 × a × √(R² - a²/4) square units

= {5/2 × 8 × √(7² - 64/4)} cm²

= {20 × √(49 - 16)} cm²

= (20 × √33) cm²

= (20 × 5.74) cm²

= (114.8) cm².

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