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mixas84 [53]
3 years ago
6

Find the height of a cylinder with a surface area of 108 pi square meters. The radius of the cylinder is twice the height.

Mathematics
1 answer:
myrzilka [38]3 years ago
4 0
Let
x---------> radius of the cylinder
y---------> the height of the cylinder

we know that
x=2y
[surface area of cylinder]=2*[pi*r²]+2*pi*r*h
surface area=108*pi m²
r=x
h=y
x=2y
108*pi=2*[pi*(2y)²]+2*pi*(2y)*y
108*pi=8*pi*y²+4*pi*y²
108*pi=12*pi*y²
y²=108/12
y²=9----------> y=√9--------> y=3 m
x=2y-------> x=2*3-----> x=6 m

the answer is
the height of the cylinder is 3 m
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The return trip was 21.2 hours long.

Step-by-step explanation:

Given,

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Let,

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Distance of plane from US = 212(x+2) = 212x+424

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As the distance will be same, therefore,

232x=212x+424\\232x-212x=424\\20x=424

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Learn more about speed at:

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3 years ago
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A square has an area of 144 sq. units. how long is its perimeter?
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\boxed {\boxed {\text {Area = Length x Length}}}

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Formula for Perimeter of a square:

\boxed {\boxed {\text {Perimeter = 4 x Length }}}

\text {Perimeter = } 4 \times 12 = 48 \text { units}


\boxed { \boxed { \text {Answer: The perimeter is 48 units.}}}


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Answer:

21

Step-by-step explanation:

3 0
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