Question

tell the answer of que no 7 for brinaliest

Answer 1

Hey Mate! Here is ur answer...
ABCD is given rectangle. So, AB=CD
and BC=AD
and angle ABC is right angle.
In ∆ABC
${ac}^{2} = {ab}^{2} + {bc}^{2} \\ {15}^{2} = {14.4}^{2} + {bc}^{2} \\ 225 - 207.36 = {bc}^{2} \\ 17.64 = {bc}^{2} \\ bc = 4.2$
BC=AD=4.2
Now, Area of rectangle = l*b
14.4*4.2
$60.48 {cm}^{2}$

Hope it may help u.....