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K = 157 cm
maka :
K = 2 x 3,14 x r
157 = 6,28 x r
r = 157 / 6,28
r = 25 cm
L = π x r²
= 3,14 x 25²
= 3,14 x 625
= 1.962,5 cm²
jawaban:
K= .d
157= 3,14
d= 157 : 3,14
d= 50
d=50 maka r= 25 setengah dr diameter
L =. r^2
L= 3,14 X 25 X 25
L= 196,25 cm^2
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