triangles

Asked by  | 13th Feb, 2009, 10:14: PM

Expert Answer:

Pls check the To Prove statement. It should be BD2-CD2=2CD.AD

Consider L.H.S

BD2-CD2

= AB2-AD2-CD2 (By pythagoras theorem in triangle ABD)

= AC2-AD2-CD2 (As ABC is isosceles triangle where AB=AC)

=(AC+AD)(AC-AD)-CD2

=CD(AC+AD)-CD2

=CD(AC+AD-CD)

=CD.2AD = 2AD.CD

Answered by  | 5th Mar, 2009, 12:40: PM

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