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luas lingkaran=phi x r²=3,14x24²=2461,76cm²
9.r=42cm
luas lingkaran=phi x r²=22/7x42²=5544cm²
Semoga bermanfaat ^_^
8. π x r² = 3,14 x 24x24= 1808,64\
mungkin nomor selanjutnya nanti insyaallah disunting :)