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12. Find the values of the angles x, y, and z in each of the following: 

           

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From the figure we can observe that :

 (i)  \angle z\ =\ 40^{\circ}                     (Vertically opposite angle)

(ii)  \angle x\ =\ 180^{\circ}\ -\ 40^{\circ}\ -\ 25^{\circ}\ =\ 115^{\circ}           (Linear pair/straight line)

(iii)  \angle y\ =\ 180^{\circ}\ -\ \angle z\ =\ 140^{\circ}  (Vertically opposite angle).

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Sanket Gandhi

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