Question

solve this Q12 plzz..

Answer 1

Take the fourth point as(x,y)
In parallelogram the diagonals bisect each other
so find the mid point of one of the diagonals from two given points and then equate it to the other two points
if n you need the solution please tell

Answer 2

let the forth point b (x,y)
mid point of (1,2) and (3,7) is (2,9/2)
and this mid point is also the mid point of the 2nd and fourth point because diagonal of parallelogram bisect each other....
so (x+2)/2= 2....... then x = 2
and (y+4)/2= 9/2....... then y = 5
so fourth vertex will be (2,5)