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I use the formula "5 times S squared divided by 4 tan36", where S is the length of the sides, 6 in this instance. 4 tan36 is very close to 2.906 so you have (5 x 6 x 6)/2.906 ie 180/2.906 = 61.941 sqcm

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12y ago
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Q: What is the area of a regular pentagon formula with side 6 cm and radius 5.1cm?
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