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Jawaban:
18. r = 30/2
r = 15
l = πr²
l = 3,14 × 15 × 15
l = 706,5 cm² ( D. )
19. r = 14
l = πr²
l = 22/7 × 14 × 14
l = 22 × 2 × 14
l = 616 cm ( A. )
20. r = 49/2
r = 24,5
l = (πrr)/2
l = (3,14×24,5×24,5)/2
l = 1.884,785/2
l = 942,3925 cm²
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