Vocab
The distance around a circle
circumference
Radius = 2 cm
Diameter = ?
4 cm
If Circle K has a radius of 18 cm and Circle R has a radius of 24 cm ...
Circle K needs to be ___________ to match Circle R.
What is the circumference if the radius is 5 in?
31.4 in
What number is used for pi?
3.14
Distance from the center to the outside of a circle
radius
Radius = 18 km
Diameter = ?
36 km
If Circle Y has a diameter of 72 cm and Circle Z has a diameter of 42 cm ...
Circle Y needs to be ___________ to match Circle Z.
reduced
What is the circumference if the radius 16 ft?
100.48 ft
Half of the diameter
radius
A straight line from one side of a circle to the other side that passes through the center point.
diameter
Diameter = 23.2 in
Radius = ?
11.6 in
Which circle has a larger circumference?
Circle C whose radius is 19 in. OR Circle L whose radius is 25 in.
Circle L
What is the circumference if the diameter is 28 cm?
87.92 cm
Twice the radius
diameter
A "pie-slice" part of a circle
sector
Diameter = 56.84 ft
Radius = ?
28.42 ft
Which circle has a smaller circumference?
Circle F whose radius is 12 cm OR Circle M whose diameter is 19 cm
Circle M
What is the circumference if the diameter is 51.7 in?
162.338 in
Name a circle object that we use to tell time.
clock
Any part of the circumference of a circle
Radius = 38.25 in
Diameter = ?
76.5 in
Which circle has a larger circumference?
Circle D whose diameter is 65 ft OR Circle H whose radius is 42 ft
Circle H
What is the circumference if the radius is 36.2 cm?
227.336 cm
Name a circle object found on transportation.
tires, wheels, steering wheel