Post on 25-Dec-2015
Perimeter and Area
Equations
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.
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.
Perimeter
Triangle:– 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
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.
Area
Area of a Triangle:– base * height divided by two
or A = (b*h)/2
Area of a Rectangle:– Area = base * height or
A = (b*h)
– Area = length * width orA = (l*w)
Practice
a = 5, b = 4, c = 3 and h = 2
What is the perimeter of the triangle?
What is the area of the triangle?
P = 5 + 4 + 3P = 12
A = (4)(2)/(2)A = 4
Practice
l = 5, w = 4
What is the perimeter of the rectangle?
What is the area of the triangle?
P = 2(5) + 2(4)P = 10 + 8P = 18
A = (5)(2)A = 10
Perimeter = l + l + w + w or P = 2l + 2w
Area = l*w