Find the circumference of a circle with a radius of 12.5 mm .
37.68mm
18.84mm
78.5mm
none of the above
5. Multiple Choice
3 minutes
1 pt
The radius of a circle is
The measurement from the center of a circle to an edge of the circle.
The measurement around the circle
The measurement from and edge of the circle to another edge through the center
A line perpendicular to the diameter of the circle
6. Multiple Choice
3 minutes
1 pt
A cruise ship has a large, circular window. It has a diameter of 6 meters. What is the window's area?
31.25 m2
29.55 m2
30.36 m2
28.26 m2
7. Multiple Choice
3 minutes
1 pt
What is the area of this circle?
163.2
15.3
124.2
113.1
8. Multiple Choice
3 minutes
1 pt
Does this picture show the diameter or radius of a circle?
Diameter
Radius
9. Multiple Choice
3 minutes
1 pt
Is the red line a radius or diameter of the circle?
Radius
Diameter
10. Multiple Choice
3 minutes
1 pt
If you multiply ½ × d then you will get the...
radius
diameter
circumference
area
11. Multiple Choice
3 minutes
1 pt
If you are given the diameter, how can you calculate the radius?
Multiply the diameter by 2
Divide the diameter by 2
Add 2 to the diameter
Subtract 2 from the diameter
12. Multiple Choice
3 minutes
1 pt
What is the distance around a circle?
Circumference
Area
Diameter
Radius
13. Multiple Choice
3 minutes
1 pt
The circumference of a circle is
The measurement from an edge of a circle to another edge.
The measurement around the circle
The measurement from an edge of a circle to another edge going through the center
The measurement from the center of the circle to an edge of the circle
14. Multiple Choice
3 minutes
1 pt
The diameter of a circle is 3 centimeters. What is the circumference?
11.5cm2
9.42 cm2
unicorns are awsome
45.3 cm2
15. Multiple Choice
15 minutes
1 pt
Alex has trained his puppy, Popper, to jump through a ring. According to Alex's measurements and calculations, the ring has a diameter of 3.5 feet. What is the ring's circumference (use 3.14 for pi)?
11.32 ft
12.25 ft
10.99 ft
8.75 ft
16. Multiple Choice
2 minutes
1 pt
What is the circumference? Round to the nearest whole number.
48
96
24
18
17. Multiple Choice
3 minutes
1 pt
A DVD has a diameter of 15 millimeters. What is the circumference?
c = 15π
C = 2π15
c = 15/π
c = 15/2π
18. Multiple Choice
2 minutes
1 pt
Which expression could be used to find the approximate circumference of this quilt piece?