Practicing Success
l is the incentre of the ΔXYZ. If ∠YlZ = 115 degree, then what is the ∠YXZ ? |
55 degree 45 degree 50 degree 60 degree |
50 degree |
In \(\Delta \)XYZ, I is the center \(\angle\)YIZ = 90 + (\(\frac{1}{2}\) x \(\angle\)YXZ) = 115 = 90 + (\(\frac{1}{2}\) x \(\angle\)YXZ) = (\(\frac{1}{2}\) x \(\angle\)YXZ) = 115 - 90 = (\(\frac{1}{2}\) x \(\angle\)YXZ) = 25 = \(\angle\)YXZ = 25 x 2 = \({50}^\circ\). |