Given:
Line segment labelled y is the midsegment of the triangle.
To find:
The measures of x, y and z.
Solution:
Since line segment labelled y is the midsegment of the triangle. So, it divides the included sides in two equal parts.
Line segment labelled y is bisector of both included sides.
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According to the midsegments theorem, the length of the midsegment is half of third side or non included side of the triangle.

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Therefore,
.