d and E are the points on the sides CA and CB respectively of a triangle ABC right angled at C prove that AE²+BD²=AB²+DE²
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Given: A right triangle ABC, right angled at C. D and E are
points on side AC and BC respectively.
To prove: AE^2+BD^2=AB^2+DE^2
Construction: Join AE, BC and DE
Proof: In triangle ACE
AE^2=AC^2+CE^2___________(I)
[By Pythagorean’s theorem]
In triangle BCD
BD^2=CD^2+BC^2___________(Il)
[By Pythagorean’s theorem]
Add (l) and (ll) we get,
AE^2+BD^2=(AC^2+BC^2) + (CE^2+CD^2)
AE^2+BD^2=AB^2+DE^2
Hence proved
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