A line in the circle that goes from the center to the circumference.
100
What is the formula for the circumference of a circle?
c=πd or c=π2r
100
Find the distance a tire travels after one rotation if the circumference of the tire is 10 inches. (use 3.14)
31.4 inches
100
Anna is planting a circular garden. If the diameter of the garden is 21 meters, what is the circumference? Use 3.14 for π.
65.94 m
100
It takes two ________ to make a ________.
radii, diameter
200
Define diameter.
A line in a circle that passes through the center and touches two places on the circumference.
200
Find the circumference of a circle with a diameter of 16 in using 3.14 for π. Round to the nearest hundredth if necessary.
50.24in
200
Find the circumference of a semi-circle with a diameter of 6 cm. (use 3.14)
9.42 cm
200
The a circular sundial has a diameter of 18 inches. Find the length of brass needed to cover the outside edge of the sundial. Use 3.14.
56.52 inches
200
The circumference measures the _________ of the circle.
Edge/Outside
300
The diameter is _________ the radius of a circle.
twice or two times
300
Find the circumference of a circle with a radius of 17 in using 3.14 for π. Round to the nearest tenth.
106.8 in
300
Find the circumference of a circle with a radius of 7.5 cm. (use π)
15π cm
300
A circular field has a circumference of 157 feet. Find the distance from the edge of the field to the center of the field.
25 feet
300
The area measure the __________ of the circle.
inside
400
A semicircle is ________ of a circle.
half
400
Find the length of the arc of a semicircle that has a diameter of 5 in. Use 3.14 for π.
7.85 in
400
Find the distance a wheel travels after 6 rotations with a diameter of 12 inches. (use 3.14)
226.08 inches
400
Teresa is making a card for her mom. The card is in the shape of a circle and has a diameter of 7 in. She wants to put ribbon around the edge of her card. How much ribbon will she need?
21.98 in
400
What are the two most commonly used estimates for π?
3.14 and 22/7
500
Define a circle.
An infinite set of points the same distance (radius) from a center.
500
Find the distance around a semicircle that has a radius of 11 in. Use 3.14 for π.
56.54 in
500
Find the distance a wheel travels after 10 rotations with a diameter of 15 inches. (use π)
150π inches
500
Find the perimeter of the composite shape. (use π)
30 + 6π cm
500
When would it be better to use 22/7 instead of 3.14 and why?
When the radius is a multiple of 7 because you can cross cancel.