1. Perimeter and Area
Equations

2. Perimeter
When you think of perimeter think of walking the fence around the perimeter of a yard.
You walk the length of each side and add the lengths up to get the total distance walked.

3. Perimeter A triangle has 3 sides to add up.
A rectangle has 4 sides to add up.
A Trapezoid also has 4 sides to add up.

4. Perimeter Triangle: Rectangle: Trapezoid: Perimeter = Perimeter =
Side 1 + Side 2 + Side 3
Rectangle:
Perimeter =
Side 1 + Side 2 + Side 3 + Side 4
Trapezoid:
Perimeter =
Side 1 + Side 2 + Side 3 + Side 4

5. Area Area is the surface that is surrounded by a shape. Examples:
The grass inside of a fenced-in area.
The rug on the floor of a room.
The turf covering a football field.

6. Area Area of a Triangle: Area of a Rectangle:
base * height divided by two or A = (b*h)/2
Area of a Rectangle:
Area = base * height or
A = (b*h)
Area = length * width or
A = (l*w)

7. Practice
a = 5, b = 4, c = 3 and h = 2
What is the perimeter of the triangle?
P =
P = 12
What is the area of the triangle?
A = (4)(2)/(2)
A = 4

8. Practice l = 5, w = 4 What is the perimeter of the rectangle?
Perimeter = l + l + w + w or
P = 2l + 2w
P = 2(5) + 2(4)
P =
P = 18
What is the area of the triangle?
Area = l*w
A = (5)(2)
A = 10