91Ó°ÊÓ

Draw two lines and a transversal. Which of the angles in the drawing are corresponding angles? Which are alternate interior angles? Which are alternate exterior angles? Which are consecutive interior angles?

Show that any two medians of a triangle intersect at a point in the interior of the triangle.

Show that the perpendicular bisectors of the sides of a triangle are concurrent at a point equidistant from the vertices of the triangle.