In an isosceles triangle, if the vertex angle is 80°, what is the measure of each base angle?
A40°
B50°
C60°
D80°
Explanation
Sum of base angles = 180° – 80° = 100°. Each base angle = 100° / 2 = 50°.
Exam Relevance
- Topic: Geometry, Mensuration & Trigonometry
- Subtopic: Triangles & Angles
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