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प्रश्न
Find the total surface area of a right circular cone with radius 6 cm and height 8 cm.
उत्तर
WKT, Total surface area = `pirl+pir^2`
Now l= `sqrth(^2+r^2)` [by Pythagoras theorem]
Here, given
Radius=6cm and height =8cm
⇒ length=`sqrt(6^2+8^2)`
= 10cm
∴ Total surface area= `pirl+pir^2`
=`(22/7xx6xx10)+ (22/7xx6xx6)`
= `(1320/7)+792/7 =301.71cm^2`
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