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125_G6U27_WB˜ ˙—» ¿º 2011.6.23 3:44 PM ˘ ` 7
125-B4-1
The Sum of the Interior Angles of a Quadrilateral
1. The sum of the interior angles of a quadrilateral is 360 . Find the measure of the
unknown angle.
Example
110 100
a. a b.
60 70 60
a 80 a
c. d.
120 125 50
a 60 a
36 33
125-B4-1
The Sum of the Interior Angles of a Quadrilateral
1. The sum of the interior angles of a quadrilateral is 360 . Find the measure of the
unknown angle.
Example
110 100
a. a b.
60 70 60
a 80 a
c. d.
120 125 50
a 60 a
36 33
