The distance formula can be used to prove a triangle has

Select one:

a. congruent sides

b. a right angle

c. parallel sides

d. congruent angles

Distance formula is used to prove that line segments are congruent and the lengths are equal.

Here is the distance formula:

sqrt [ (x2-x1) ^2 + (y2-y1) ^2]

Hence the right answer is:

a. congruent sides