Question 66739
Show that the quadrilateral with vertices A(-3,5), B(-1,0), C(11,12), and D(1,9) is a trapezoid.
SLOPE OF AD=(9-5)/(1+3)=4/4=1
SLOPE OF BC=(12-0)/(11+1)=12/12=1
HENCE AD||BC
HENCE ABCD IS A TRAPEZIUM