- AEquilateral
- BRight-angled
- CObtuse
- DScalene
Step-by-Step Solution
If all three angles are equal (each 60°), all sides are equal, so it is equilateral.
Answer: A) Equilateral
If the vertex angle of an isosceles triangle equals each of its base angles, the triangle is:
Class 9Properties of Isosceles TrianglesGeometry — Triangles
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