The two inside angles add up to the external angle's total. The m∠1 will be 69°. Option D is correct.
What is angle measurement?
An angle measure is the measurement of the angle created by two rays or arms at a shared vertex in geometry. A protractor is used to measure angles in degrees (°).
From the exterior angle property, the sum of the exterior angle is the sum of the two interior angles.
The m∠1 will be 69°.
Hence, option D is correct.
To learn more about the angle measurement, refer to the link;
https://brainly.com/question/14684647
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