Question

Find the area of a regular polygon whose side and radius of circumscribed circle is given : (a) n = 7, a = 5 cm, R=6 cm​

Answer 1

Answer:

Area of pentagon = [2n×a×R2−4a2] sq. units

=[25×8×72−74]cm2

=[20×49−16]cm2

[20×33]cm2

=[20×5.74]cm2

=(114.8)cm2