Question

Se considera punctele A(-1,-2),B(3,0) si C(5,3) aflati coordonatele punctului D,stiimd ca ABCD este paralelogram

Answer 1

ABCD este paralelogram daca diagonalele se injumatatesc.
AC∩BD={O}
XO=(XA+XC)/2=(-1+5)/2=4/2=2
XO=(XB+XD)/2 => 2= (3+XD)/2 => 4=3+XD => XD=1
YO=(YA+YC)/2=(-2+0)/2=-2/2=-1
YO=(YB+YD)/2=> -1=(0+YD)/2 => -2=YD
D(1;-2)