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jsully5159
29.11.2019 •
Mathematics
the base of a regular pyramid is a hexagon whose perimeter is 84 feet. the volume of the pyramid is approximately 4,677.85 cubic feet. find the height of the pyramid.
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Ответ:
The height of the pyramid is![27.56\ ft](/tpl/images/0396/3360/ce8a3.png)
Step-by-step explanation:
we know that
The volume of the pyramid is equal to
where
B is the area of the base of the pyramid
H is the height of the pyramid
step 1
Find the area B of the regular hexagonal base
we know that
The perimeter of a regular hexagon is
where
b is the length side of the hexagon
we have
substitute
solve for b
Remember that the area of a regular hexagon is the same that the area of six equilateral triangles
Determine the area of the six equilateral triangles, applying the formula of the law of sines
substitute the value of b
step 2
Find the height of the pyramid
we have
substitute
solve for H
Ответ:
The top one on the left
Step-by-step explanation: