Penjelasan dengan langkah-langkah:
4. a. k=2×π×r
k=2×22/7×28
k=176
l=π×r²
l=22/7×28×28
l=2464cm²
b k=2×π×r
k=2×22/7×14
k=88
l=22/7×14×14
l=616
5.r=94,2:π:2
r=94,2:3,14:2
r=15
d=2r
d=30
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Penjelasan dengan langkah-langkah:
4. a. k=2×π×r
k=2×22/7×28
k=176
l=π×r²
l=22/7×28×28
l=2464cm²
b k=2×π×r
k=2×22/7×14
k=88
l=π×r²
l=22/7×14×14
l=616
5.r=94,2:π:2
r=94,2:3,14:2
r=15
d=2r
d=30