Question

of the diagonal of a rectangle is 17cm and its perimeter is 46cm the area of the rectangle is​

Answer 1

let length = x and breadth = y then  

2(x+y) = 46         =>   x+y = 23  

x²+y² = 17² = 289  

now (x+y)² = 23²  

=> x²+y²+2xy= 529  

=> 289+ 2xy = 529

=> xy = 120  

area = xy = 120 sq.cm