- A48
- B58
- C106
- D53
Step-by-Step Solution
Interior B = 180 - 121 = 59; interior C = 180 - 112 = 68. Interior A = 180 - 59 - 68 = 53°.
Answer: D) 53
In triangle ABC, side BC is produced both ways. The exterior angle on one side at C is 112° and the exterior angle at B (other side) is 121°. Using exterior angle and angle-sum reasoning, find the interior angle A.
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