Circle Vocab
Finding Radius
Finding Diameter
Finding Circumference
Finding Area
100
The distance from the center of a circle to a point on the circle, also known as half of the diameter
Radius
100
Which figure shows the radius?
Figure 1
100
Which figure shows the diameter?
Figure 2
100
Which figure shows the circumference?
Figure 3
100
What is the exact area of the circle?
Hint: Use A=pi(r)^2
4pi in^2
200
The name for a "half" circle
Semicircle
200
What is the radius of this circle?
9 in
200
What is the diameter of this circle?
14 in
200
What is the exact circumference of the circle?
Hint: Use C = 2pi(r)
14pi in
200
Find the exact area of the circle.
Hint: Use A=pi(r)^2
144pi ft^2
300
The name for a "one-fourth" circle
Quarter circle
300
What is the radius of a circle with a diameter of 30 feet?
15 ft
300
The radius of a circle is 288 yards, what is the diameter?
576 yd
300
Find the exact circumference of a circle with a diameter of 25 feet.
Hint: Use C = pi(d)
25pi ft
300
Find the exact area for a circle with a diameter of 20 yards.
Hint: Use A=pi(r)^2
100pi yd^2
400
The total amount of space inside of a circle
Area
400
A circle has a diameter of 437 cm, what is the radius?
218.5 cm
400
What is the diameter of a circle with radius 26.8 centimeters?
53.6 cm
400
What is the exact circumference of a circle with a diameter of 15.5 yards?
Hint: Use C = pi(d)
15.5pi yd
400
What is the exact area for a circle with a diameter of 70 meters?
Hint: Use A=pi(r)^2
1225pi m^2
500
The perimeter of a circle
Circumference
500
A circle has a diameter of 0.325 yards, what is the radius?
0.1625 yd
500
What is the diameter of a circle with a radius of 0.264 millimeters?
0.528 mm
500
What is the approximate circumference of a circle with a radius of 20 inches?
Hint: Use C = 2pi(r)
approx. 125.6 in
500
Find the approximate area of a circle with a radius of 12 feet.
Hint: Use A=pi(r)^2
approx. 452.16 ft^2