By the Midpoint Theorem in △ABC, MN ∥ BC, so MN ∥ BD. In △ABD, line MN passes through the midpoint M of AB parallel to BD, so by Theorem 7 it bisects AD.
Cbse Class 9 Maths Ganita Manjari Part 2 Solutions
class 9 maths ganita manjari part 2 chapter 12 question answer
By the Midpoint Theorem in △ABC, the segment MN joining the midpoints of AB and AC is parallel to base BC. Consequently, the line MN is parallel to segment BD on BC. Now consider △ABD. The line containing MN passes through the midpoint M of AB and is parallel to BD. By the Converse of the Midpoint Theorem, it bisects the third side AD.
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