Geometry Concepts -4

1. All triangles lying between two parallel lines and built on the same base have equal area.

If AB and CF are parallel lines,

∆ABC = ∆ABD = ∆ABE = ∆ABF

2. All parallelograms lying between two parallel lines and built on the same base have equal area.

If AB and CH are parallel lines,

oABEC = oABGD = oABHF