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