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2πr = 56,52
πr = 56,52 / 2
πr = 28,26
r = 28,26 / π
r = 28,26 / 3,14
r = 9 cm
luas = πr²
= 3,14 * 9²
= 3,14 * 81
= 254,34 cm²
56,52 = 2 . 22 . r
7
7 . 56,52 = 44 . r
r = 395,64
7
r = 56,52
l. lingkaran = . r²
= 3,14 . 3194,51
= 10.030,76
maaf klo slh