Radius & Diameter
Circumference and Area
Parts of circles
Circles in the real world
100
The diameter is 10 inches. Find the radius.
What is 5 inches?
100
A circle has a diameter of 12.5 inches. What is the circumference?
What is 39.25 inches?
100
A circle has an area of 12 ft squared. It is cut into 4 equal pieces. What is the area of each piece?
What is 3 ft2?
100
A bicycle wheel has a radius of 1 foot. If the bicycle wheel rotates one time, what distance is traveled?
6.28 feet
200
The radius is 25 feet. Find the diameter.
What is 50 feet?
200
A circle has a diameter of 25 inches. What is the circumference?
What is 78.5 inches?
200
**DAILY DOUBLE**
A circle has a circumference of 21.98 feet. What is the area of half of the circle?
What is 19.2325 ft. squared?
200
A large Jeep has a tire with a radius of 18 inches. Find the circumference of the wheel.
What is 113.04 inches?
300
The circumference of the circle is 56.52 or
56.52
.
Find the radius.
What is 9 inches?
300
A circle has a radius of 50 miles. What is the area of the circle?
What is 7850 mi2.
300
A pizza is 16 inches long (the diameter). The pizza is cut into 8 pieces. What is the length of crust (circumference) on each piece?
What is 6.28 in?
300
A wheel has a radius of 50 cm.
Find the area.
What 7,850 cm squared.
400
The circumference of a circle is
78.5
inches.
Find the radius.
What is 12.5 inches?
400
A circle has a diameter of 16. What is the area of the circle?
What is 200.96 square units?
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?
What is 48 pi in2
400
***DAILY DOUBLE***
John owns a circular pool in his backyard. If he swims around the pool, he swims 94.2 meters. What is the radius of this circle?
What is 15 meters?
500
A circle has a circumference of
803.84 cm.
Find the diameter.
What is 256 centimeters?
500
A circle has a circumference of 18.84 inches.
What is the area?
What is 28.26 square inches?
500
What is the area of the shaded region in terms of pi?
What is 12pi?
500
A pizza with a diameter of 22 inches cost $28. How much does one square inch of pizza cost?
What is about $0.07 per square inch.