Answer:
step 4 I believe
Step-by-step explanation:
I think it is -5,-4,-1/4, 1.75, 6.2, 9, 18 1/2, 21
Answer: 
Step-by-step explanation:
Hello :
the <span>coordinates </span> circumcenter for ∆DEF :
x = (1+7+1)/3
y = (1+1+5//3
x=3
y= 7/3
D because perpendicular lines intersect at a right angle and D is the only shape with right angles.