Radius & Diameter
Circumference
Area
Working Backwards
Identify Parts of the Circle
100
The distance from the center of a circle to any point of the circle.
What is the radius?
100
Also known as the perimeter of a circle.
What is the circumference?
100
The formula for the area of a circle?
What is A= π•r2?
100
A bicycle wheel has a radius of 1 foot. If the bicycle wheel rotates one time, what distance is traveled in both terms of π and using 3.14 as an approximation for π.
What is 2π or 6.28 feet?
100
What does the dotted line represent?
What is the diameter?
200
The distance across a circle measured through its center.
What is the diameter?
200
A circle has a diameter of 3 inches. This is the circumference. Use π = 3.14.
What is 9.42 inches?
200
A circle has a diameter of 16 units. Find the area. Round to 2 decimal places.
What is 200.96 units2?
200
The circumference of a wheel is 113.04 inches. The radius of the wheel is this when using 3.14 as an approximation for π and rounding to the nearest whole inch.
What is 18 inches?
200
What is the name of the green part of the circle?
What is the circumference?
300
The radius is 4 inches. What is the diameter?
What is 8 inches?
300
A circle has a diameter of 102.38 inches. What is the circumference? Use π = 3.14
What is 321.47 inches?
300
A circle has a radius of 50 miles. What is the area of the circle TO THE NEAREST MILE?
What is 7854 mi2.
300
If your circumference is 72.98 m. This is radius if 3.14 is used as an approximation for π and the radius is rounded to the nearest tenth of a meter.
What is 11.6 m?
300
What does the blue line represent?
What is the radius?
400
The Diameter is 25 meters. What is the Radius?
What is 12.5 meters?
400
A circle has a radius of 16 feet. Find the Circumference. Use π = 3.14.
100.48 feet
400
A pizza is 16 inches long (diameter). It is cut into 4 pieces. Jane eats 3 of the pieces. What is the area of pizza she is eating in terms of pi?
What is 48 π in2?
400
John owns a circular pool in his backyard. If he swims around the pool, he swims 30 pi meters. What is the radius of this circle?
What is 15 meters.
400
What Greek letter is used to represent the ratio of a circle's circumference to diameter?
What is pi?
500
The Radius is 81 cm. What is the Diameter?
What is 162 cm?
500
If the radius is 123.45, this is the circumference. Use π = 3.14
What is 775.266?
500
If the diameter is 14 cm, the area of the circle is this in terms of π.
What is 49π cm2?
500
A circle has a circumference of 18.84
What is the area?
What is 28.26 units squared
500
What is this line called?
What is the chord?