ISEE Mathematics Achievement Question 222: Answer and Explanation
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Question: 222
6. In the following figure, if ∠6 measures 90°, what is the measure of ∠1?
- A. 25°
- B. 35°
- C. 45°
- D. 55°
Correct Answer: C
Explanation:
C is correct. In this problem ∠6 measures 90°. Thus ∠3 also measures 90°. Because the two sides of the triangle are equal, it is an isosceles triangle. That makes ∠1 and ∠2 equal. Since ∠3 = 90°, that leaves 90° to be split equally between ∠1 and ∠2. So each angle measures 45°.