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luas lingkaran=phi x r²=22/7x21²=1386cm²
7.r=20cm
luas lingkaran=phi x r²=3,14x20²=1256cm²
Semoga bermanfaat ^_^
L=22/7x21x21=1386 cm
7) r=20 cm
L= 3,14x20x20=1256 cm