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3 years ago

Volume & surface! May I please have help

Mathematics

1 answer:

Ludmilka [50]3 years ago

3 0

Answer:

Step-by-step explanation:

surface area of cylinder

=(area of base)×2 + (area of curved surface)

$=(\frac{20}{2} )^{2} \pi$ × 2 + $20\pi$ × 25

=2 × $\pi$ × $10^{2}$ + 2 × $\pi$ × 10 × 25

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Step-by-step explanation:

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4 years ago

Find the height of a cone with a volume of 942 cubic units and a radius of 10 units

Dmitry [639]

Volume of a cone: $\frac{1}{3}$ $\pi$ r²h
Plug the radius and volume in the formula.

$\frac{1}{3}$ $\pi$ 10²h = 942
Divide both sides by $\frac{1}{3}$ .

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Divide both sides by pi.

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Divide both sides by 10² (100).

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The cone's height is 9 units.

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3 years ago