Terms
Draw the radius on a circle.
Show me your drawing.
Find area of a circle if the radius is 12 in. Use 3.14 for pi and your answer to the nearest tenth.
452. 7 in2
What is the circumference of a circle with a diameter of 15 in? Use 3.14 for pi and your answer to the nearest tenth.
47.1 in
Draw the diameter on your white board.
Show me your board.
Jada traces a circle from a roll of duct tape that has a diameter of 6 inches. What is the area of the circle she traced in terms of pi?
A 6ℼ in squared
B 36ℼ in squared
C 9ℼ in squared
D 3ℼ in squared
C
A Ferris wheel moves in a circular motion and measures 56 meters from the top car to the bottom car. How far does the car travel one time around the Ferris wheel? Use 3.14 for pi and your answer to the nearest tenth.
175.8 meter around
the formula for circumference
C=pid or C=2pir
What is the area of a circular pool with a diameter of 22 feet? Use 3.14 for pi and your answer to the nearest tenth.
379.9 feet2
Use the information given and solve for the missing information. Use 3.14 for pi and your answer to the nearest tenth.
Radius: 30 in
Diameter:
Circumference:
diameter is 15 in
Circumference is 47.1 in
the formula for Area of a Circle
A=pir2
Use the information given and solve for the missing information. Use 3.14 for pi and your answer to the nearest tenth.
Radius: 20 in
Diameter:
Area:
diameter is 40 in
area is 1256 in2
Use the information given and solve for the missing information. Use 3.14 for pi and your answer to the nearest tenth.
Radius: 4.5 feet
Diameter:
Circumference:
diameter is 9 feet
circumference is 28.3 feet
Fill in the blank.
The mathematical constant pi (ℼ) is the ratio of the ____________________________ of a circle to its _____________________.
circumfernce, diameter
Use the information given and solve for the missing information. Use 3.14 for pi and your answer to the nearest tenth.
Radius:
Diameter: 15 m
Area:
radius is 7.5 m
area is 176.6 m2
A tire has a diameter of 26 inches. How far will the tire travel in 2 rotations? Use 3.14 for pi and your answer to the nearest tenth.
the tire will travel 163.3 inches
Liam walks a path around a circular pond. The path is 85 yards long. What is the distance to the center of the pond? Use 3.14 for pi and your answer to the nearest tenth.
the distance to the center of the pond is 13.5 yards