Question

find the area of a regular Pentagon with a side of 7cm and the radius of the circumscribed circle is 8 cm​

Answer 1

Area of pentagon = [

2

n

×a×

R

2

−

4

a

2

] sq. units

=[

2

5

×8×

7

2

−74

]cm

2

=[20×

49−16

]cm

2

[20×

33

]cm

2

=[20×5.74]cm

2

=(114.8)cm

2