SOLUTION: If I need to find the pro numeral of something with a polygon, how would i solve it with algebra? The problem that I have tried to solve so far is: 360 = 58 + 147 + 2r + 3r 360

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Question 762660: If I need to find the pro numeral of something with a polygon, how would i solve it with algebra?
The problem that I have tried to solve so far is:
360 = 58 + 147 + 2r + 3r
360 = 205 + 2r + 3r
How do i know what r is and what does the 2 and 3 represent?
-Brandon Preap

Answer by Stitch(470) (Show Source):
You can put this solution on YOUR website!
From what you have stated I am guessing that you were given a 4 sided polygon with interior angles of 58, 147, 2R & 3R.
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If that is the case, then the 2 & 3 are just multipliers. To make the angle larger.
You were on the right track to find the value of R but you need to do a few more steps.

Combine like terms.

Subtract 205 from both sides.

Divide both sides by 5.
.
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Since you know the value of R, you can go back and check the problem.