Presentation on theme: "Circumference & Area of a Circle MA.6.4.1: Estimate the circumference and area of a circle Period 4."— Presentation transcript:
Circumference & Area of a Circle MA.6.4.1: Estimate the circumference and area of a circle Period 4
Definition Circumference is the distance around a circle or the perimeter. Formula = Pi x diameter Area is the measure of the amount of surface enclosed by the boundary of a figure. Formula = r x r x pi
Example: Circumference Formula = Diameter x Pi Diameter = 2 in. Pi = 3.14 2 x 3.14 = 6.28 in. 2 in.
Example: Area Formula = radius x radius x Pi Radius = 5 cm. Pi = 3.14 5 x 5 x 3.14 = 78.5 sq. cm. 5 cm.
Problem Kristle 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.
Solution The area of Kristles circle is 530.66 in. because if the diameter is 26 in. then the radius must be 13 in. (26/2=13) 13 x 13 = 169 169 x 3.14 = 530.66 sq. in. The circumference of Kristles circle is 81.64 in. because 26 x 3.14 = 81.64
Credits 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 use Microsoft PowerPoint: Definition from Connected Mathematics. Hope you enjoyed my fantabulous presentation on the circumference and the area of a circle.