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640 = 1/3*3,14*8^2 t
640=200,96/3t
t=640*3/200,96
t=1920/200,96
t=9,55
b)s=akar t+r
=akar 9,55+8
=akar 17,55
=4,189
b. s = √ r² + t² = √ 8² + 3,18² = √ 64 + 10,11 = √74,11 = 8.6 cm
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