Question

the length of the diagonals of a quadrilateral are 11 cm and 12 cm .is it a rectangle ? of no, give reasons​

Answer 1

Explanation:

In a parallogram, diagonals bisect one another, thus you can set the two segments that are labeled in the picture equal to one another, then solve for x.  

So, 

2x−2=x+12→x=14.

If x=14, then you can substitute 14 into each labeled segment, to get a total of 52.

2(14)−2+14+12

28−2+14+12=52