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