perimeter

Each course contains three components:

  • Worksheets

    Instructional Objectives:: These worksheets provide detailed, percentage-related problem-solving examples to foster critical, independent thinking.
    Learning Materials:: 7 episodes of instructional videos

    Episode 1 | Definition of Percent [Level 1, 2]
    Episode 2 | Converting a Percent to a Fraction [Level 1, 2]
    Episode 3 | Converting a Fraction to a Percent [Level 1, 2, Advanced]
    Episode 4 | Converting a Percent to a Decimal [Level 1, 2, Advanced]
    Episode 5 | Converting a Decimal to Percent [Level 1, 2, Advanced]
    Episode 6 | Calculating Portion [Level 1, 2, 3, Advanced 1, 2]
    Episode 7 | Calculating Rate [Level 1, 2, 3, Advanced]
    Episode 8 | Calculating Base [Level 1, 2, 3, Advanced 1, 2]

  • Step-by-Step

    Instructional Objectives:: The Step-by-Step video component shows how to practically apply the perimeter principals introduced previously to working examples.
    Learning Materials:: 7 episodes of instructional videos

    Episode 09 | Definition of Perimeter   [01:34]
    Episode 10 | Calculating Perimeter Using Addition   [01:32]
    Episode 11 | Calculating the Perimeter of a Rectangle   [02:10]
    Episode 12 | Calculating the Width of a Rectangle   [03:27]
    Episode 13 | Circle Terminology   [00:44]
    Episode 14 | Calculating the Diameter of a Circle   [05:29]
    Episode 15 | Calculating the Perimeter of Complex Shapes   [00:49]

  • Worksheets

    Instructional Objectives:: These worksheets provide detailed, perimeter-related problem-solving examples to foster critical, independent thinking.
    Learning Materials:: 7 episodes of instructional videos

    Episode 09 | Definition of Perimeter   [Level 1, 2, Advanced]
    Episode 10 | Calculating Perimeter Using Addition   [Level 1, 2, 3]
    Episode 11 | Calculating the Perimeter of a Rectangle   [Level 1, 2, 3, Advanced]
    Episode 12 | Calculating the Width of a Rectangle   [Level 1, 2, 3, Advanced]
    Episode 13 | Circle Terminology   [Level 1, 2]
    Episode 14 | Calculating the Diameter of a Circle   [Level 1, 2, 3, Advanced]
    Episode 15 | Calculating the Perimeter of Complex Shapes   [Level 1, 2, 3, Advanced]

 
 
 

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Definition of Perimeter
Definition of Perimeter

A Short Review...

Perimeter is the “girth” or measurement around objects or shapes. It can be straight, curved or totally irregular. Perimeter can be plainly measured taking a single measurement, or measured in a few bits and then those measurements need to be added.

Calculating Perimeter Using Addition
Calculating Perimeter Using Addition

A Short Review...

A polygon is a closed plane figure containing three or more angles and bounded by three or more straight sides. The word polygon itself means “many sides”. In a shape or object with many sides, you can just add the lengths of the sides. It`s as simple as that.

Calculating the Perimeter of a Rectangle
Calculating the Perimeter of a Rectangle

A Short Review...

Adding the side lengths on a rectangle could be fairly simple:

Perimeter of a rectangle = Length + Width + Length + Width

You can of course multiply:

Perimeter of a rectangle = (Length + Width) x 2

If you work in fractions, make sure you can add and multiply them without a problem.

Calculating the Width of a Rectangle
Calculating the Width of a Rectangle

To find the width of a rectangle given the perimeter and the length, do the following:

  1. Divide the perimeter by 2
  2. Take away the length (or subtract the length)
Circle Terminology
Circle Terminology

What is a Circle?

Mathematically, a circle is a closed curve representing the set of points some fixed distance from a given point called the center. In the circle below the center point is labelled "O".

  • Radius: We call radius the distance between the center of a circle and any point along the circle. It is represented by the letter r.
  • Diameter: The diameter of the circle is the distance between two points along the circle measured through the center. It is represented by the letter d.
Calculating the Diameter & Circumference of a Circle
Calculating the Diameter & Circumference of a Circle

To find the diameter given the circumference divide the circumference by π. D = C ÷ π

EXAMPLE
What is the biggest diameter of the circle you can make out of 18 in. of cord?

SOLUTION
Diameter = 18 ÷ π = 18 ÷ 3.14 = 5.729 inches

Calculating the Perimeter of 2-D Complex Shapes
Calculating the Perimeter of 2-D Complex Shapes

Perimeter can be calculated by breaking up a composite shape into simple shapes and adding up their lengths. Watch the video to see calculating the perimeter of an ice rink.

Parallelograms, Trapezoids, Hexagons, Octagons and other geometric shapes can be broken up into triangles and rectangles. Their perimeters can also be calculated by adding up the appropriate side lengths of those triangles and rectangles.

Further Studies
Further Studies
Where to go from here...

First of all congratulations!

Interested in Euclidean plane geometry for 2D computer graphics...or 3-dimensional Euclidean geometry for 3D computer graphics? Here are a few reference points from A to Z that may peak your interest.

NOTE: Select a thumbnail from above for a lesson unit description
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