Perpendicular height of a cone is 12 cm and its slant height is 13 cm. Find the radius of the base of the cone.
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Solution
let the radius of the base of the cone be rcm Height of the cone, h=12cm slant height of the cone, I=13cm Now, r2+h2=I2 ⇒r2+(12)2=(13)2 ⇒r2+144=169 ⇒r2+=169−144=25 ⇒r=√25=5cm Thus, the radius of the base pf the cone is 5cm