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b.sisi bandul=2πr²+πrs=πr.(2r+s)=22/7.7.(14+25)=22 x 39
=858cm²
c.volume bandul=2/3 πr³+πr²t/3=πr²(2/3r+24/3)
=22/7.49.(2/3.7+8)
=154.38/3=1950,7cm³