ISEE Mathematics Achievement Question 199: Answer and Explanation

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Test Information

Question: 199

5. In the equilateral triangle shown, what is the measure of each angle?

  • A. 60°
  • B. 90°
  • C. 120°
  • D. 140°

Correct Answer: A

Explanation:

A is correct. In an equilateral triangle, all three angles are equal. Since the sum of the angles in a triangle is 180°, each angle must be 180 ÷ 3 = 60°.

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