MEASUREMENT UNITS AND PERIMETER
To build or make something, we must have the correct materials before we can start creating. To build a fence, we would buy a length of fencing in feet. To cover a floor in a new house, we would buy an area of carpet in square feet. To make a patio, we would buy a volume of cement in cubic yards.Perimeter is the distance around an object. We’ll examine the perimeter of a rectangle and other objects made of line segments.
Length, Area, and Volume Units
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Perimeter of a Rectangle To find the perimeter of a rectangle you would add all sides. In this case you would add 8 + 14 + 8 + 14 which would give 44 inches. A formula for this method would be P = L + W + L + W.
P = (2 × 14) + (2 × 8) P = 44 inches Formula: P = (2 × L) + (2 × W)
There is a third way to find the perimeterof the rectangle. Fill in the blanks.
P = 2 × (14 + 8) P = 44 inches
Formula: P = 2 × (L + W) |
Perimeter of Triangles and Quadrilaterals
To find the perimeter of a polygon you add all sides. Complete the formula for determining the perimeter of a triangle where the length of its sides are represented with a, b, and c. Study the formula for determining the perimeter of a parallelogram where the length of the longer side is represented by b and the length of the shorter side is represented by a. Study the formula for determining the perimeter of a square where the length of one side is represented by s. |
Find the Perimeter |
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Unit 24 Perimeter Worksheet |