An umbrella you bought is shaped like a regular octagonal pyramid with a side length of four feet and a slant height of feet. Es
timate the amount of fabric that the umbrella has.
1 answer:
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First calculate the missing angle 
. By knowing all angles in triangle have a sum of 180°.
Now we required to use angle functions in a right triangle. The cosine of
is equal to the relation of side 
and hypotenuse 
.
Now we solve this for hypotenuse.
Now put in the numbers.
So we know the length of hypotenuse and length of side therefore side 
can be calculated using Pythagorean theorem: 
.
Solve for side.
So there you go. If you have any questions feel free to ask.
r3t40
Now we required to use angle functions in a right triangle. The cosine of
Now we solve this for hypotenuse.
Now put in the numbers.
So we know the length of hypotenuse and length of side
Solve for side
So there you go. If you have any questions feel free to ask.
r3t40