Question

Q is a point in the interior of a rectangle abcd. if qa = 3 cm, qb = 4 cm and qc = 5 cm, then the length of qd in centimetre is

Answer 1

given qa=3cm,qb=4cm,qc=5cm,qd=?
the relation is that 
qa²+qc²=qb²+qd²
qd²=qa²+qc²-qb²
qd²=3²+5²-4²
qd²  =9+25-16
qd²   = 18
qd=√18 ans

Answer 2

Answer:

qd=

$6 \sqrt{3}$