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Answer

small circle area : total area = 3 : 11

Unshaded area : small circle area = 8 : 3             Note : 8 is derived from 11 – 3

Area of unshaded area = 8 /3 * 87 cm² = 232 cm²

 

 

Perimeter of triangle ABC = 14 cm

Perimeter of triangle DEF = 14 * 9/2 = 63 cm

Length of 1 side of triangle DEF = 63/3 cm = 21 cm

 

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