epdf.pub_cbest-cliffs-test-prep13a9b242c7cb4125e6cca92d00a73d5a41681

Measurement
No special formulas are really necessary, although two are commonly seen.
Area
perimeter( P)
of a square = 4s
(s = length of side)
perimeter( P)
of a parallelogram (rectangle and rhombus) = 2l+ 2wor
2 ( l+ w)( l= length, w=
width)
Area (A) means the amount of space inside the polygon. The formulas for each
area are as follows:
■
Triangle: A = 1 ⁄2 bh (b = base, h = height)
h
or
h
b
b
A triangle is a three-sided polygon. In a triangle, the base is the side the
triangle is resting on, and the height is the distance from the base to the
opposite point, or vertex. For example:
A = 1 ⁄2 bh
A = 1 ⁄2 (24) (18) = 216 sq in
18″
■ Square or rectangle: A= lw
24″
w
l
l
l
or
w
w
w
l
A square is a four-sided polygon with all sides equal and all right angles
(90 degrees). A rectangle is a four-sided polygon with opposite sides equal
and all right angles. In a square or rectangle, the bottom, or resting side, is
the base, and either adjacent side is the height. For example:
A= lw ( ) = 4( 4)
= 16sq in
4″
4″
221