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π×r×r
=22/7 × 35 × 35
=3.850 Cm
No 10
garis trngah 42 maka jari2nya 42/2= 21
= 22/7*21*21
= 1386cm²
9. L= π*r²
= 22/7*35*35
=3850 cm²
10. L=π*r²
=3,14*45*45
= 6358,5 bisa dibulatkan 6359cm²
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