Asked by Sara

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.
Answered by Reiny
The angles of a quad add up to 360ยบ
so
2x + x-7 + x+5 + 3- = 360

solve for x
Answered by IMO Gold
Cyclic quads
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