Circumference
What is the formula for the circumference of a circle?
C=πd
A dinner plate has a radius of 4 inches. What is the area of the dinner plate?
50.24 Inches
If you have a car tire with a diameter of 14 inches. What is the radius of the car tire?
7 Inches
What one of the formulas for diameter?
r/2 or c/pi
What part of the circle is half the diameter?
Radius
A wheel has a radius of 35 centimeters. Determine it's circumference.
Use 3.14 as pi.
219.8 centimeters
Which figure has the largest area?
A - A circle with a radius of 7
B - A circle with a diameter of 8
C - A circle with an area of 50
D - A square with a perimeter of 20
Use 3.14 as pi.
B - A circle with a diameter of 8.
What is the radius of a circle that has an area of 78.5?
Use 3.14 as pi.
5
1+1=?
Use 3.14 as pi.
2
What is the formula for the area of a circle?
A=πr2
What is the circumference of a circle with a radius of 81 feet?
Use 3.14 as pi.
508.68 feet.
You get a prize if you get the right answer to this question!
The diameter of a circle is 4 miles. What is the circle's area?
Use 3.14 as pi.
12.56 miles squared.
How do you find the radius of a circle?
Divide the diameter by 2.
What is the diameter of a circle that has an area of 12.56?
Use 3.14 as pi.
4
Do you need area or circumference to solve this problem?
How much fabric is needed for a round tablecloth?
Area
Carly had a pineapple pie with a diameter of 8 inches. She ate a quarter of the pie, then shared another quarter of the pie with her friends. What is the perimeter of the pie now?
Use 3.14 as pi.
20.56 inches
The government owns 300 plates. They all have a diameter of 7 inches. How many inches squared are all 300 plates combined?
Use 3.14 as pi.
11,539.5 inches squared.
How do you find the radius of a circle if all you have is the area?
You divide the area by pi, then find the square root of that answer.
What is the diameter of Little Billy's frisbee?
His frisbee has a radius of (43)-3 centimeters.
Use 3.14 as pi.
122 centimeters.
About how many squares fit inside of a circle. Think of the radius squares activity we did in class!
About 3 or exactly 3.14 squares
What is the circumference of a circle that has an area of 200.96?
Use 3.14 as pi.
50.24
What is the area of a circle that has double the radius as a circle that has a circumference of 18.84 inches?
Use 3.14 as pi.
113.04 inches squared.
Billy Bob has a circle. The circle has an area of 50.24 centimeters squared. What is the circle's radius?
Use 3.14 as pi.
4 centimeters
What is the diameter of a circle with an area of 50.24 feet squared?
Use 3.14 as pi.
8 feet
How many digits are in the solution to 2230?
Use 3.14 as pi.
70 digits