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785 = 3,14 × r2 × 10
785 = 31,4 × r2
r2 = 785 ÷ 31,4
R = 25
jdi jari2 ny 25 cm
t=10cm
r=?
V =π×r²
785cm³=3,14×r×10cm
785cm³(3,14×10cm)=25cm
r²=25cm²
r=√25cm²
r=5cm
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