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Question

In the adjacent figure AB || CD; CD || EF and y : z = 3 : 7, find x.
570706_20505e29acd7434ebcee31496a286ea0.png

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Solution

Let y and z be 3u and 7u

x=z (Alternate angles)

x+y=180 (Angles made on same side of transversal)

Put x=z

z+y=180

7u+3u=180

10u=180

u=18010=18

z=7×18=126

x=z=126

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