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jadii
a.r= 1/2 x 15 = 7,5
2πr = 2 x 3,14 x 7,5
= 47,1
b. r= 1/2 x 20 = 10
2πr = 2 x 3,14 x 10
= 62,8
sekian terima kasih :)
keliling lingkaran=2 pi r=2.3,14.7,5=47.1
b.di ketahui d=20 beraati r=10
keliling lingkaran:2 pi r:2.3,14.10=62,8