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Find the lateral and surface area of each cone

Find the lateral and surface area of each cone-example-1

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Answer:


\large\boxed{L.A.=153\pi\ mm^2}\\\boxed{S.A.234\pi\ mm^2}

Explanation:

The formula of a lateral area of a cone:


L.A.=\pi rl

r - radius

l - slant height

The formula of a surface area of a cone:


S.A.=\pi r^2+\pi rl

We have r= 9mm and l = 17mm. Substitute:


L.A.=\pi(9)(17)=153\pi\ mm^2


S.A.=\pi(9^2)+153\pi=81\pi+153\pi=234\pi\ mm^2

User Jens Schwarzer
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