ISEE Mathematics Achievement Question 219: Answer and Explanation
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Question: 219
3. In the triangle shown, ∠ACB measures 55° and ∠CAB measures 65°. What is the measure of ∠CBA?
- A. 50°
- B. 60°
- C. 80°
- D. 90°
Correct Answer: B
Explanation:
B is correct. The angles in a triangle total 180°. The two given angles measure 55° + 65° = 120°. Thus the remaining angle must measure 180° − 120° = 60°.