Circle Vocab
The distance from the center of a circle to the outside edge; half of the diameter.
radius
The diameter of this circle is 5 cm. Find the radius.
2.5 cm
The radius of a circle is 46 inches. What is the circle's circumference?
288.88 in
𝜋r2
area formula of a circle
The label for volume.
The label for surface area.
cubic units
square units
Part of a circle - the area between two radii (radiuses) and the connecting arc of a circle.
sector
The circumference of the circle is 282.6 units. Find the diameter.
90 units
The diameter of a circle is 38 yards. What is the circle's area?
1133.54 yd2
Bh
volume formula of a circle
Find the volume of a cylinder with a height of 4.5 yd and a radius 1.9 cm. Round your answer to the nearest hundredth.
51.01 cm3
Any straight line segment that passes through the circle's center and whose endpoints lie on the circle.
diameter
The area of a circle is 1256 square units. find the radius.
20 units
Lloyd is walking his dog around the pond at the park. The pond is a circle with a diameter of 2 miles. How far does Lloyd walk if he walked all the way around the pond?
6.28 miles
𝜋d
circumference formula of a circle
Find the volume of a cylinder with a diameter of 10 ft and a height of 8 ft.
628 cubic feet
The total amount of space inside of a circle
area
The circumference of this circle is 15.7 units. Find the diameter.
5 units
A dog is leashed to a point in the center of a large yard, so the area the dog is able to explore is circular. The leash is 20 feet long. What is the area of the region the dog is able to explore?
1,256 ft2
ph+2B
surface area formula of a circle
Find the surface area of a cylinder with a height of 10 mm and a diameter of 10 mm.
471 mm2
The ratio of a circle's circumference to its diameter.
Pi
The tires on a car can travel 81.64 inches in 1 rotation. What is the diameter of the tires?
26 inches
A container can hold 3 tennis balls. The diameter of all 3 tennis balls combined is 8.1 inches. Find the circumference of one of the tennis balls.
8.478 in.
arc + d
perimeter of a circle's sector
Find the surface area of a cylinder with a radius of 8 ft and a height of 12 ft.
1,004.8 square ft