Two straight lines are specified by y=a+cx and y=b+cx, respectively, where b≥a. What’s the distance d between them in terms of a, b and c?
Two squares share a vertex at the origin and have their sides along the x- and y-axis. Two vertices lie on the line satisfying x+2y=c. What is the proportion purple : yellow?
Two parallel lines support two rectangles. Prove they have equal area.
Two congruent isosceles triangles and three lines. Prove triangle AEF is also isosceles.