The bisector divides a triangle into two isosceles triangles. Find the angles of the original triangle?
March 28, 2021 | education
| Consider a triangle ABC, where the angle ABC is equal to α.
Let ВM be a bisector.
Then, the angles CBM = ABM = α / 2.
Since the side ВM cannot be equal to the sides AB and BC, then, according to the condition ВM = MС and ВM = MA.
Then the angle MAВ = angle ABM = α / 2, angle MСВ = angle CBM = α / 2.
MAВ + MСВ + ABC = 180º.
α / 2 + α / 2 + α = 180º
α = 90º.
Thus, triangle ABC is right-angled with right angle B and angles A and C equal to 45 degrees.
Answer: the angles of the original triangle are 90º, 45º, 45º.
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