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44 = 22/7 * d
d = 7/22* 44= 14
luas = phi * r²
= 22/7 * 49 = 154
44 = 2 . 22/7 . r
44 = 44/7 . r
r = 44 . 7 / 44
r = 7 cm
L = π . r²
L = 22/7 . 7²
L = 22/7 . 49
L = 1078 / 7
L = 154 cm²