Question

height of a cone is 9cm its base diameter is 24 cm . what is the slant height ? find total surface are of a cone

Answer 1

Answer:

slant height=15cm,,,total surface area =$\pi$(12)(27)=324

Step-by-step explanation:

since $l^{2} = h^{2} + r^{2}$ ; r= radius i.e. 24/2= 12cm and height is given to us as 9 cm thus we got slant height as 15 cm.

total surface area = $\pi r(l+r)$ and putting values we got as 324$\pi$$cm^{2}$

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