Question

find the area of a rectangular park whose one side is 15 cm and its diagonal is 30 cm.

Answer 1

Answer:

According to Pythagoras theorem:-

${d}^{2} = {l}^{2} + {b}^{2}$

${30}^{2} = {15}^{2} + {l}^{2}$

$900 = 225 + {l}^{2}$

${l}^{2} = 900 - 225$

${b}^{2} = 675$

$l = \sqrt{675}$

l=25.9807621135

l=25.98cm

Now,

Since

Area=l×b

=25.98cm×15cm

$= 389.70cm^2$

OR:-

l=26cm(approx)

b=15cm

Area=l×b

=26cm×15cm

$= 390cm^2$