Radii of the top and the base of a frustum are 12 cm, 6 cm respectively. Its height is 8 cm. Then,
A
2110.08cm3
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B
1130.4cm2
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C
565.2cm2
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Solution
r1=12 cm , r2=6 cm, h=8 cm Slant height of the frustum, l=√h2+(r1−r2)2 l=√82+(12−6)2 l=√64+36 l=10 cm CSA of the frustum = π(r1+r2)l = 3.14(12+6)10 = 565.2cm2 TSA of the frustum = πl(r1+r2)+πr21+πr22 = 3.14×10(12+6)+(3.14×122)+(3.14×62) = 1130.4cm2 Volume of the frustum = 13πh(r21+r22+r1r2) = 13×3.14×8(122+62+12×6) = 2110.08cm3