prove the theorem

"Two triangles having same base and equal areas lie between same parallel lines."

Hi!
Here is the proof for you.
 
Theorem: Triangles having the same base and equal areas lie between the same parallels.
Given: DPQR and DSQR such that ar (DPQR) = ar (DSQR).
Construction: Draw PL and SM perpendicular to QR
To prove: PS || QR
Hence, PS || QR
 
Cheers!

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 open NCERT textbook

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 actually m a cbse student nd study ncert text book.but i m unable to understand the theorem clearly.

tmrw s my test plz help

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