WAEC - Mathematics (1990 - No. 30) | ExamPlay

WAEC - Mathematics (1990 - No. 30)

In the diagram above, WXYZ is a rhombus and ∠WYX = 20°. What is the value of ∠XZY

20^o

30^o

45^o

60^o

70^o

Explanation

Diagonals bisect at 90°; < YXZ = 90° - 20° = 70°

But ZY = XY (sides of a rhombus)

\(\therefore\) < XYZ = 70° (base angle of an isos. triangle)

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