Geometry and TrigonometryEasyType of triangle from two angles
Geometry and Trigonometry practice question
A triangle has two angles that measure 30° and 60°. Which of the following describes the triangle?
- A. It is a right triangle.Correct
- B. It is equilateral.
- C. It is obtuse.
- D. It has two equal angles.
Answer: A. It is a right triangle.
The third angle is 180 − 30 − 60 = 90°.
Why the other answers are wrong
- B. It is equilateral.
- Equilateral triangles have three 60° angles.
- C. It is obtuse.
- No angle exceeds 90°.
- D. It has two equal angles.
- The angles are 30°, 60° and 90°, all different.
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