Answer:
3
Explanation:
Midpoint between two lines is given by
x1+ x2/2; y1 + y2/2
midpoint between lines /AD/
x = x1+ x2/2 = -11 + (-8)/2 = -9.5
y = 3+ (-2)/2 = 3- 2/2 = 1/2 = 0.5
midpoint between lines /BC/
x = 0 + (-1)/2 = -1/2 = -0.5
y = 3+ (-2)/2 = 1/2 = 0.5
(x1,y1) = (-9.5, 0.5)
(x2,y2)= (-0.5,0.5)
the midsegment of the trapezoid ;
√(x2 - x1)² + (y2- y1)²
= √9
=3