The radii of the top and bottom of a bucket of slant height 13 cm are 9 cm and 4 cm respectively. The height of the bucket is
Answer: B
l⊃2; = h⊃2; + (R-r)⊃2; => 13⊃2; = h⊃2; + (9 – 4)⊃2; ⇒ 169 = h⊃2; + 25 ⇒ h⊃2; = 169 – 25 ⇒ h⊃2; = 144 ⇒ h = 12