Page:Sheet Metal Drafting.djvu/39

Rh Example of Problem 4E.

Example of Problem 4F.

Example of Problem 4G.

The end blank is in the form of a trapezoid, the area of which is equal to one-half the sum of the upper and lower bases multiplied by the altitude. In this example the lower base is 4½", the upper base 3½", and the altitude 2½".