Angles on a Straight Line Worksheets

This set of PDF worksheets are packed with tremendous practice in finding the measure of an angle that shares a common vertex with the other angles on a straight line. Each figure in this set of printable worksheets depicts the measures of two to four angles and one angle is indicated for practice. Since all the angles lie on a straight line and are adjacent, the angle addition postulate comes into play. Add the known angles and subtract the sum from 180° to find the measure of the indicated angle. Scroll down the PDF for the answer key.

These worksheets cater to the students of grade 4 and grade 5.

CCSS: 4.MD.7

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Worksheet 1
Worksheet 2