geometry

find the measure of angel R in quadrilateral RSTW if the measure of angle R= 2x, the measure of angle S= x-7, the measure of angle T= x+5, and the measure of angle W= 30.

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asked by Sara
  1. The angles of a quad add up to 360º
    so
    2x + x-7 + x+5 + 3- = 360

    solve for x

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    posted by Reiny
  2. Cyclic quads

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    posted by IMO Gold

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