Geometry help with polygons and angles?

hoda h

New member
1. The expressions (9x+5)° and (11x-25)° represent the measures of two angles of a regular nonagon. Find the measure of an angle of the nonagon.
2. Each figure is a regular polygon. Expressions are given for two side lengths. Find the value of x. The first figure is a square with two sides labeled x²+x and x²4. The second is a nonagon with two sides labeled x²+2x+40 and x²-+190
please explain!!!!!!!! This will help alott!!!!!!(:
 
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