Quadrilaterals. A quadrilateral is a four-sided polygon. The sum of the measures of the
Chapter 12, Problem 12.3.18(choose chapter or problem)
Quadrilaterals. A quadrilateral is a four-sided polygon. The sum of the measures of the angles of any quadrilateral is 360. In the illustration, the measures of A and B are the same. The measure of A is 20 greater than the measure of A, and the measure of D is 60 less than B. Find the measure of ,B, , and . C
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