Cracking The SAT Premium

Here are some rules you’ll need to know about rectangles and squares:

1. The perimeter of a rectangle is the sum of the lengths of its sides.
   Just add them up.

perimeter   =   10  +   4   +   10  +   4   =   28

2. The area of a rectangle is length × width.
   The area of the preceding rectangle, therefore, is 10 × 4, or 40.

Little  Boxes

Here’s  a   progression of

quadrilaterals  from    least

specific    to  most    specific:

quadrilateral   is  any

4-sided figure

↓               

parallelogram   is  a

quadrilateral   in  which

opposite    sides   are parallel

↓               

rectangle   is

a   parallelogram   in  which

all angles  =   90  degrees

↓               

square  is  a   rectangle   in

which   all sides   are equal

3. A square is a rectangle whose four sides are all equal in length.
   The perimeter of a square, therefore, is four times the length of any side. The area is the length of
   any side squared.