Geometry and TrigonometryEasyVertex angle of an isosceles triangle
Geometry and Trigonometry practice question
In an isosceles triangle, the two equal base angles each measure 70°. What is the measure of the third angle?
- A. 40°Correct
- B. 70°
- C. 110°
- D. 20°
Answer: A. 40°
180 − 70 − 70 = 40.
Why the other answers are wrong
- B. 70°
- 70° would make all three angles 70°, summing to 210.
- C. 110°
- 110° is 180 − 70, subtracting only one base angle.
- D. 20°
- 20° is half of 40; the third angle is the full remainder.
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