21. In the given figure, if PQ || XZ, ZYPQ = 50°and ZYXZ = 70°, find ZXYP.
P
0 Q.
50°
3
Y
70°
X

21. In the given figure, if PQ || XZ, ZYPQ = 50°and ZYXZ = 70°, find ZXYP.
P
0 Q.
50°
3
Y
70°
X
z​

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  1. Answer:

    As the sum of all interior angles of a triangle is 180º, therefore, for ΔXYZ,

    ∠X + ∠XYZ + ∠XZY = 180º

    62º + 54º + ∠XZY = 180º

    ∠XZY = 180º − 116º

    ∠XZY = 64º

    ∠OZY = 32º (OZ is the angle bisector of ∠XZY)

    Similarly, ∠OYZ == 27º

    Using angle sum property for ΔOYZ, we obtain

    ∠OYZ + ∠YOZ + ∠OZY = 180º

    27º + ∠YOZ + 32º = 180º

    ∠YOZ = 180º − 59º

    ∠YOZ = 121º

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