Presentation on theme: "Circumference & Area of a Circle"— Presentation transcript:
1Circumference & Area of a Circle MA.6.4.1: Estimate the circumference and area of a circlePeriod 4
2DefinitionCircumference is the distance around a circle or the perimeter.Formula = Pi x diameterArea is the measure of the amount of surface enclosed by the boundary of a figure.Formula = r x r x pi
3Example: Circumference Formula = Diameter x Pi Diameter = 2 in. Pi = x 3.14 = 6.28 in.2 in.
4Example: AreaFormula = radius x radius x Pi Radius = 5 cm. Pi = x 5 x 3.14 = 78.5 sq. cm.5 cm.
5ProblemKristle wanted to find the area and the circumference of a circle with a diameter of 26 in. Find the area and circumference of her circle.26 in.
6SolutionThe area of Kristle’s circle is in. because if the diameter is 26 in. then the radius must be 13 in. (26/2=13) x 13 = x 3.14 = sq. in.The circumference of Kristle’s circle is in. because 26 x 3.14 = 81.64
7Credits I give credit to my parents for giving me support…… I also give credit to my math teacher, Mr. Imamura for teaching me what the circumference and area is and the formula for each……I also give credit to my friends (Kristle mostly) for helping me useMicrosoft PowerPoint:Definition from Connected Mathematics.Hope you enjoyed my fantabulous presentation on the circumference and the area of a circle.