Question

the diagonal of a rectangle is 5 cm and one of at sides is 4 cm .It's area ?

Answer 1

diagnol=5
root(l^2 + b^2) =5
root(4^2 +b^2)=5
16+b^2=25
b^2=25-16
b^2=9
b=3
area= l×b
area=4×3
=12cm is answer

Answer 2

Hey

Here is ur answer......

Let ,other side of rectangle be x.

Diagonal²=length²+width²

5²=4²+x²

25=16+x²

25-16=x²

9=x²

√9=x

3=x

Hence ,Area=l×w

⇒4×3

⇒12cm²

Hope this helps!

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