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r = 37.5
luas = πr²
= 3.14 x 37.5 x 37.5
= 4415.625 cm²
2. d = 60 cm
r = 30 cm
luas = πr²
= 3.14 x 30 x 30
= 2826 cm³
3. d = 92 cm
r = 46 cm
luas = πr²
= 3.14 x 46 x 46
= 6644.24 cm²