Mensuration is that branch of Mathematics which is employed in ascertaining the extension, solidities and capacities of bodies capable of being measured.

To Measure Or Ascertain The Quantity Of Surface In Any Right Lined Figure, Whose Sides Are Parallel To Each Other, As Jigs. 1, 2 And 3

Square. 1.

Rectangle. 2.

Rhomboid. 3.

Rule. - Multiply the length by the breadth or perpendicular height and the product will be the area or superficial contents.

Application of the Rule to Practical purposes.

The sides of a square piece of iron is 9 7/8 inches in length required the area.

Decimal equivalent to the fraction 7/8 = .875. (See page 91), and 9.875 x 9-875 = 97.5, etc., square inches the area.

2. The length of a Roof is 60 ft. 4 in., and its width 25 ft. 3 in. required the area of the Roof.

4 inches = 333 and 3 inches = .25, (See table of equivalents,) hence, 60.333 X 25.25 = 1523.4 Square feet the area.