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r = 1/2 d = 1/2 x 14 = 7cm
1/2πr²
1/2 x 22/7 x 7 x 7
1/2 x 22 x 7
11 x 7 = 77cm²
LO = phi x r^2
= 22 per 7 x 7^2
= 22 per 7 x 49
= 154 cm^2
karena kolam berbentuk setengah lingkaran, maka :
1 per 2 x 154 = 77 cm^2
moga bantu