luas lingkaran yg kelilingnya 31,4 cm adalah
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r : ?
r : 31,4/3,14
r : 10 cm
luas : π.r²
: 3,14 . 10.10
: 3,14 . 100
: 314 cm
31,4 = 2 x 22/7 x r
31,4 x 2 x7 : 22 = r
19,98 = r
L = r²
L= 3,14 x 19,98 x 19,98
L= 1253,48 cm² ≈ 1253,5 cm²
semoga membantu..