In Exercises 29 to 31,
Given: 





Find: 

To find:
For
Calculation:
Given,
M and N are the midpoints of sides
A line segment that joins the mid points of two sides of a triangle is parallel to the third sides and has a length equal to onehalf the length of the third side.
Thus,
Now, in
But,
Since, angle opposite to the equal sides are equal in measure,
By the angle sum property of a triangle in
Add;
Divide; by 2 on both sides,
Thus,
Hence,
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