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Perimeter of Ploygons and Circumfrence of Circles

In this topic, we will learn to calculate the perimeter of polygons, and estimate circumference of circles.

Topic: Perimeter of Squares and Rectangles

  • The distance around a shape is called perimeter. In other words, perimeter is the distance around the outside of a closed figure

  • Perimeter is the sum of length of all the sides of a polygon

  • Perimeter of a rectangle with length l and width w is 2 x (l + w)

  • Perimeter of a square with side s is 4 x s

  • Remember to name the unit of length used to measure the shape

Topic: Perimeter of Other Shapes

  • Perimeter is the distance around the outside of a closed figure

  • Perimeter is the sum of all the side lengths of a polygon

  • Perimeter of a regular polygon of n equal sides with each side s is n x s

  • Remember to name the unit of length used to measure the shape

Topic: Find Missing Measurements

  • Perimeter is the sum of length of all the sides of a polygon

  • Perimeter of a rectangle with length l and width w is 2 x (l + w)

  • Perimeter of a square with side s is 4 x s

  • Use the formulas and equate the known and unknown lengths

  • Remember to name the unit of length used to measure the shape

Topic: Perimeter on a Coordinate Graph

  • To find the perimeter of a polygon, add the lengths of all its sides

  • The x-coordinate is the first number in each ordered pair; the y-coordinate is the second number in each ordered pair

  • To find the length of a horizontal line segment, find the distance between the x-coordinates

  • To find the length of a vertical line segment, find the distance between the y-coordinates

  • Remember to name the unit of length used to measure the shape

Topic: Find Circumference

  • The circumference of a circle is the distance around the circle

  • The circumference of the bicycle wheel is the length around its round edge when measured by the tape

  • The diameter of a circle is any line segment that passes through the center of the circle and touches both endpoints on the circle

  • The circumference of a circle is about 3 times the diameter
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