The perimeter of a rectangle: | |
To find the perimeter of a rectangle, just add up all the lengths of the sides: Perimeter = L + w + L + w = 2L + 2w |
The area of a rectangle: | |
To find the area of a rectangle, just multiply the length times the width: Area = L x w |
The sides and angles of a rectangle: |
Opposite sides of a rectangle are the same length (congruent). The angles of a rectangle are all congruent (the same size and measure.) Remember that a 90 degree angle is called a "right angle." So, a rectangle has four right angles. Opposite angles of a rectangle are congruent. Opposite sides of a rectangle are parallel. |
The diagonal of a rectangle: | |
To find the length of the diagonal of a rectangle, use the Pythagorean Theorem: length of diagonal = d So... |
Properties of the diagonals of a rectangle: | |
As you can see from the pictures to the left, the diagonals of a rectangle do not intersect in a right angle (they are not perpendicular). (Unless the rectangle is a square.) And the angles formed by the intersection are not always the same measure (size).Opposite central angles are the same size (they are congruent.) | |
The pieces created when the diagonals intersect are congruent. |
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