## Triangle and Parallelogram of Same Base and Between the Same Parallels

1. Summary

Figures that lie between two parallel lines such that their
bases are common and lie on one of the parallel lines, and the
vertices opposite to the base lie on the other parallel line, are
said to be figures on the same base and between the same parallels.
Parallelograms on the same base and between the same parallels are
equal in area. The area of a triangle is equal to half the area of
a parallelogram, if they are on the same base and are between the
same parallels.