m<5=40.
a. Given.
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m<2 = 140 degrees
b. given
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<5 and <2 are supplementary angles
c. Sum of <5 and <2 is 180 degree.
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< 5 and <2 are same side-interior angles
d. Same side-interior angles are called Consecutive Interior Angles.
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a||b
e. When Consecutive Interior Angles are supplementary (sum 180) the linear are parallel.