OTHER POLYGONS
- Characteristics of a Rectangle
A rectangle is a four-sided figure with four right angles. Opposite sides are equal. Diagonals are equal.
Quadrilateral ABCD above is shown to have three right angles. The fourth angle therefore also measures 90 degrees, and ABCD is a
rectangle. The perimeter of a rectangle is equal to the sum of the lengths of the four sides, which is equivalent to 2(length + width).
Area of Rectangle = length × width
The area of a 7-by-3 rectangle is 7 × 3 = 21.
- Characteristics of a Parallelogram
A parallelogram has two pairs of parallel sides. Opposite sides are equal. Opposite angles are equal. Consecutive angles add up to
180 degrees.