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4-4Example 3
Sketch supplementary angles when one angle’s measure is 75°.
1. Use the center point on the protractor as the common vertex of the supplementary angles.
4-4Example 3
Sketch supplementary angles when one angle’s measure is 75°.
2. Draw one side of the angle and place an arrow at the end of the ray.
4-4Example 3
Sketch supplementary angles when one angle’s measure is 75°.
3. The sum of supplementary angles equals 180°. Find the angle on the protractor’s scale and make a dot. Use a straightedge to draw a second ray that connects at the vertex.
4-4Example 3
Sketch supplementary angles when one angle’s measure is 75°.
4. Find the given angle, 75°, inside the 180° angle and make a dot. Use a straightedge to draw the ray that connects the vertex and the dot at 75° from either of the two existing rays.
4-4Example 3
Sketch supplementary angles when one angle’s measure is 75°.
5. Find the missing angle by using the protractor’s scale. The supplementary angle is 105°.