The problem asks to find the angle at which the angle bisectors of the acute angles in a right triangle intersect.

GeometryTrianglesAngle BisectorsRight TrianglesAngles
2025/3/29

1. Problem Description

The problem asks to find the angle at which the angle bisectors of the acute angles in a right triangle intersect.

2. Solution Steps

Let the two acute angles of the right triangle be α\alpha and β\beta.
Since it's a right triangle, we know that α+β=90\alpha + \beta = 90^{\circ}.
The angle bisectors of these angles will be α2\frac{\alpha}{2} and β2\frac{\beta}{2}.
Let the angle at which these bisectors intersect be γ\gamma.
Consider the triangle formed by the two angle bisectors and the line segment connecting the points where the bisectors meet the legs of the right triangle. The angles of this triangle are α2\frac{\alpha}{2}, β2\frac{\beta}{2}, and γ\gamma.
The sum of the angles in a triangle is 180180^{\circ}, so
α2+β2+γ=180\frac{\alpha}{2} + \frac{\beta}{2} + \gamma = 180^{\circ}.
We can rewrite this as
α+β2+γ=180\frac{\alpha + \beta}{2} + \gamma = 180^{\circ}.
Since α+β=90\alpha + \beta = 90^{\circ}, we have
902+γ=180\frac{90^{\circ}}{2} + \gamma = 180^{\circ}.
45+γ=18045^{\circ} + \gamma = 180^{\circ}.
γ=18045\gamma = 180^{\circ} - 45^{\circ}.
γ=135\gamma = 135^{\circ}.
However, this is the obtuse angle. The acute angle is 180135=45180^{\circ} - 135^{\circ} = 45^{\circ}. But that is incorrect because the intersection angle is clearly larger than a right angle. We are looking for the angle γ\gamma.
γ=135\gamma = 135^{\circ}.

3. Final Answer

135 degrees

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