Answer:
12
Step-by-step explanation:
Use the pythagorean theorem to find the answer.
a^2+b^2=c^2
Answer: A) 12
Distance formula: d = √(x1 - x2)^2 + (y2- y1)^2
Substitute the values of the first and second x and y's
D= √(-9+9)^2 + (-5-7)^2
D= √(0)+ (144)
D= √144
D=12
this triangle is an acute triangle