Question

the height of the cone is 20 cm and its base radius is 6cm. find its curved surface area and total surface area if the cone

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Answer 1

Curved surface area of a cone

$h=20cm$

$r=6cm$

Curved surface area of cone=πrl

$l=\sqrth^2+r^2$

$l=\sqrt(20)^2+(6)^2$

$l=\sqrt400+36$

$l=\sqrt436$

$l=20.88$

$Curved surface area of cone=πrl$

$=π×6×20.88$

$=\frac{22}{7}×6×20.88$

$=393.3792$

Total surface area of a cone

Total surface area of cone= $πrl+πr^2$

$=393.3792+π(6)^2$

$=393.3792+\frac{22}{7}×36$

$=393.3792+113.04$

$=506.4192$

Hope it help u

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