Question 1117316
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the sum of the {{{highlight(interior)}}} {{{highlight(angles)}}} {{{highlight(of)}}} {{{highlight(the)}}} polygon is 20 right angles. How many sides does the polygon have? 
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<pre>
We are given that the sum of interior angles of the polygon is 20*90° = 1800°.


There is the formula for the sum of interior angles of a polygon via the number of its sides

S = (n-2)*180°.


Thus you have an equation to find "n":


(n-2)*180° = 1800°.


It gives you n - 2 = {{{1800/180}}} = 10.


Hence, n = 12 + 2 = 12.


<U>Answer</U>.  The number of sides of the polygon is 12.
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Solved.