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In isosceles triangle ABC (AB = AC), the bisectors of the two base angles B and C meet at point I.
If the vertex angle A = 50°, find angle BIC, in degrees.

Class 9Properties of Isosceles TrianglesGeometry — Triangles
  • A115
  • B125
  • C105
  • D230

Step-by-Step Solution

Base angles = deg each; half-angles = 32.5°. Angle BIC = deg. (Also equals )
Answer: A) 115

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