Find the measure of the third angle
Use your trig functions the get the sides
Then calculate area and perimeter
Answer and Step-by-step explanation:
To solve for r, we need to get everything away from r. We can start off by moving five thirds, and pi.

Multiply each side by
, then divide by
(pi)

Now, take the cubed root of both sides.
^^ That is the answer.
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You could multiply 118.56 by .16 which is 19 dollars rounded and subtract 19 from 117.56 to get your answer