Question

inthe given figure ,ABCD is a quadrilateral in which BC=3cm,AD=13cm,DC=12cmandAngleABD=angleBCD=90°calculate the length of AB

Answer 1

heya...
here is the answer

................. dont forget to like it.....................


by pythagoras theorem in
rt. tri DBC
$bd = \sqrt{ {dc}^{2} + {cb}^{2} }$
BD =
$\sqrt{144 + 9}$
$= \sqrt{153} \: cm$
now
in rt. tri ABD,
AB =
$\sqrt{ {ad}^{2} - {db}^{2} }$
$= \sqrt{169 - 153} \: cm$
$= \sqrt{16} \: cm$
AB $= 4 \: cm$

hope this helps you
please like it and mark as brainlist
thanks