hitunglah luas lingkaran jika di ketahui:: A=r= 7cm B=d=20 cm

a.L=
[tex]\pi {r}^{2} = 22 \div 7 \times {7}^{2} = 154[/tex]
b. L=
[tex] \frac{1}{4} \pi {d}^{2} = \frac{1}{4} (3.14) {20}^{2} = 314[/tex]

A). r=7cm
L=π r²
=22/7x7²=22/7x49=22x7=154cm²

B). d=20
r=20:2=10
L=π r²
=3,14x10²=3,14x100=314cm²

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