Circumference & Area of Circles

On the circle given, draw and label a radius and a diameter. You can use r for radius and d for diameter. How do you correctly say the formula for circumference? circumference = 2 times 3.14 times radius circumference = 2 plus 3.14 plus radius circumference = 2 times 3.14 times diameter How do you correctly say the formula for the area of a circle? area = 3.14 times radius times 2 area = 3.14 times radius times radius area = 3.14 times diameter times diameter Matching Vocabulary Formulas To "Match" the two columns, click on the circle on the left column and then drag to the matching circle on the right. A squiggly line will connect them to each other. Distance around the outside of a circle (word) Circumference Distance from center to the edge of a circle Radius Distance from one side of a circle to the opposite side passing thru the center Diameter Formula for finding the circumference of a circle given the radius C = 2 π r The amount of space that a circle takes up is called its _ Area Formula for finding the area of a circle A = π r^2 If you are given the radius, use it in the formulas. If you are given the diameter, you need to find the radius before using the formulas. To find the radius, you will need to cut the diameter in half. To do this, you divide the diameter by 2. For example, if the diameter is 6, the radius is 6 divided by 2 which is = to 3. Which best represents the circumference of the circle shown?Use 3.14 for π 28.26 m 113.04 m 56.52 m 18 m Which best represents the area of the circle shown?Use 3.14 for π 254.34 sq m 56.52 sq m 63.585 sq m 25.26 sq m Which best represents the circumference of the circle shown?Use 3.14 for π 113.04 sq m 75.36 m 37.68 m 226.08 m Which best represents the area of the circle shown? Use 3.14 for π 367.68 meters 113.04 square meters 144 square meters 452.16 square meters Sort the following based on if you saw them in a word problem so you would know if you were finding the circumference or the area. To do this, take one item, click on the box and drag it to the proper column. The term will now be placed in the column you indicated. Circumference Border Around Plastic edging feet, inches, meters, ... Area Space taken up How much frosting covers the top of a cake Round rug covering a floor square feet, square inches, square meters.... Brad is putting a 10 foot diameter circular flower garden in his yard. He will put plastic edging along the flowerbed. Is this question asking for circumference or area? circumference area Brad is putting a 10 foot diameter circular flower garden in his yard. He will put plastic edging along the flowerbed. How many feet of edging will Brad need to enclose his flower garden?Use 3.14 for π 314 sq feet 62.8 feet 78.5 sq feet 31.4 feet Kelsey bought a circular rug that is 16 feet in diameter. How much space does the rug cover?Is this question asking for circumference or area? circumference area Kelsey bought a circular rug that is 16 feet in diameter. How much space does the rug cover? Use 3.14 for π 200.96 sq feet 100.18 sq feet 50.24 sq feet 803.84 sq feet