Vocabulary
Name the collection of points equidistant from a point called the center
Circle
What is the circumference of a circle if:
the diameter = 14 yds?
43.96 yd
What is the length of an arc with a central angle of 90 degrees in a circle with circumference 4pi?
pi
Trevor needs a new bicycle tire. His tire has a circumference of about 112 inches. What is the diameter of his tire? (round to the nearest tenth place)
35.7 in
A sector with a radius of 10cm and has a angle measure of 350
30.54
Name the line segment that cuts a circle in half
Diameter
What is the circumference of a circle if:
the diameter = 18 yds?
56.52 yds
What is the length of an arc with a central angle of 60 degrees in a circle with diameter 6?
60/360 * 6pi = 1/6 * 6pi = pi
Gene’s frying pan is 14.5 inches in diameter. What is the circumference of his frying pan? (round to the nearest tenth place)
45.5 in
A circle with a diameter of 20cm and a sector with an angle of 45o. What is the area of this sector?
39.26 or 12.5pi
What do you call half of the diameter?
radius
What is the circumference of a circle if:
the diameter = 16.8 yds? (round to nearest tenth)
52.8 yds
see google slide #1
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Brad uses 31.4 meters of plastic edging to create the border of a circular flower garden in his yard. How far is it from the center of the garden to the edge?
5 m
See google slide #2
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The outside measurement of a circle (Hint: similar to perimeter)
Circumference
What is the circumference of a circle if:
the diameter = 14.8 yds? (round to nearest tenth)
46.5 yds
An arc with central angle 90 degrees has a length of 10 pi. What is the circumference of the circle?
10pi = 90/360 * C = 1/4 C
C = 40pi
Macy measures a truck’s tire mark for one complete revolution as 120.48 inches long. What is the diameter of the tire? (round to the nearest tenth place)
38.4 in
See google slide #3
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The part of a circle described by a central angle
Arc
What is the circumference of a circle if:
the diameter = 11.8 yds? (round to nearest tenth)
37.1 yds
An arc with central angle 120 degrees has a length of 12pi. What is the diameter of the circle?
36
The circular fountain in front of the courthouse has a radius of 9.4 feet. What is the circumference of the fountain? Round to the nearest tenth.
59 ft
See google slide #4
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