Question

please send me the answer for this fast please ​

Answer 1

let the fourth vertex be D(x,y)

diagonal of AC = diagonal of BD

(1+8/2 , 5+2/2) = ( x+2/2 , y+3/2 )

(9/2 , 7/2) =( x+2/2 , y+3/2)

comparing

9/2 = x+2/2 or 7/2 = y+3/2

2x+2 = 18 or 2y+6 = 14

2x = 16 or 2y = 9

x = 8 or y= 9/2

so the vertex of D (8, 9/2)

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