Question

find the length of the diagonal of a rectangle whose sides are 12cm and 5cm

Answer 1

Solution :



Given AB=12cmAB=12cm

BC=5cmBC=5cm

Find ACAC

We know that by Pythagoras theorem

AC2=AB2+BC2AC2=AB2+BC2

=122+52=122+52

=144+25=144+25

=169=169

AC=169−−−√AC=169

=13=13

Hence the length of the diagonal is 13cm13cm

Answer : 13 cm

Answer 2

diagonal of rectangle=√l^2+b^2

=√12^2+5^2

=√144+25

=√169

=13 cm