First you calculate the angle marked in red which is \(y-z\)

And the you calculate the angle marked in violet \(x+y-z\). Since the angle in violet is a straight line you can write:

\(x+y-z=180\)

Substituting the values of x and y we can obtain the value of \(z=40.\)

Attachments

Inkedlines_LI.jpg [ 812.11 KiB | Viewed 384 times ]

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