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One angle of an isosceles triangle measures 100°.
How many such distinct isosceles triangles (by angle set) are possible?

Class 9Properties of Isosceles TrianglesGeometry — Triangles
  • A0
  • B1
  • C2
  • D3

Step-by-Step Solution

100° cannot be a base angle (two would exceed 180), so 100° is the vertex; base angles are each 40°. Only one angle set: 100, 40, 40.
Answer: B) 1

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