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L=π×r²
154 cm²=22/7r²
r²=154÷22/7=49
r=√49=7cm
d=2r
d=2×7cm=14cm
diameternya adalah 14 cm
L=π×r²
154 cm²=22/7r²
r²=154÷22/7=49
r=√49=7cm
d=2r
d=2×7cm=14cm
diameternya adalah 14 cm