Use the exterior angle of a triangle
An exterior angle equals the sum of the two remote interior angles.
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An exterior angle of a triangle is 127°. One remote interior angle is 58°. What is the other remote interior angle?
Answer: 69
An exterior angle of a triangle is 84°. One remote interior angle is 54°. What is the other remote interior angle?
Answer: 30
Two remote interior angles of a triangle are 50° and 49°. What is the exterior angle at the third vertex?
Answer: 99
Tip: An exterior angle equals the sum of the two remote interior angles.
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