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In figure below, $\angle B
"
Given:
$\angle B<90^o$ and segment $AD \perp BC$.
To do:
We have to show that $b^2=h^2+a^2+x^2-2ax$.
Solution:
In $\triangle ADC$, by using Pythagoras theorem,
$ AC^2=AD^2+DC^2$
$b^2=h^2+(a-x)^2$
$b^2=h^2+a^2+x^2-2ax$
Hence proved.
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