If three points are coplanar, are they collinear? ? true or false

What is the area of triangle abc if a = 8, b = 11, and c = 15?

Which statement explains how you could use coordinate geometry to prove the opposite sides of a quadrilateral are congruent? a. use the slope formula to prove the slopes of the opposite sides are the same. b. use the slope formula to prove the slopes of the opposite sides are opposite reciprocals. c. use the distance formula to prove the lengths of the opposite sides are the same. d. use the distance formula to prove the midpoints of the opposite sides are the same.

Which diagram shows lines that must be parallel lines cut by transversal?