Question

A right circular cone having r 5 cm and height 12cm . Find the csa

Answer 1

answer is 204.2cm² thank you first you solve slant height and after curved surface area

Answer 2

Given: r = 5cm, h = 12cm

To find : CSA

Sol :
$l \: = \: \sqrt{ {r}^{2} + {h}^{2} } \\ l \: = \: \sqrt{ {5}^{2} + {12}^{2} } \\ l \: = \: \sqrt{ 25 + 144} \\ l \: = \: \sqrt{ 169} \\l = 13 \: cm$

CSA of cone = πrl

CSA of cone = 3.14 × 5 × 13

CSA of cone = 204.1 cm^2


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