find the C.S.A of a cone whose h=16cm ,and r=12cm
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ɢɪᴠᴇɴ, ʜ = 16 ᴄᴍ
ʀ = 12 ᴄᴍ
sᴏ, ʟ = √H² + R²
= √256 + 144
= √400
= 20 cm
curved surface area of a cone = πrl
= 22/7 x 12 x 20
= 754.28 cm²
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