Hello Sneha
Are you talking about this post https://www.teachoo.com/1712/522/Example-8---CM-and-RN-are-the-medians-of-ABC-and-PQR/category/Examples/ ?
If CM and RN are medians, then angle M or angle N cannot be 90 degrees.
M and N will be mid-points, not perpendiculars.
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