Radius and Diameter
A radius of 6 mm -- what is diameter?
12 mm
What is the formula for circumference when you have radius or are looking for the radius?
C = 2(pi)r
If the radius of a circle is 5.5 cm, what is the area? Round to two decimal places.
94.99 cm2
A round swimming pool is 12 feet from one side to the other. What is the circumference?
37.68 ft
What is the radius of a circle if the circumference is 100 m? Round to two places.
15.92 m
A diameter of 15.5 in--what is radius
7.75 in
C = (pi)d
If the diameter of a circle is 25 mm, what is the area? Round to two decimal places.
490.63 mm2
A horse is tethered to a post in the middle of a fenced area with a lead that is 10 feet long. How much area does the horse have to wander around in?
314 ft2
What is the radius of a circle with an area of 706.5 cm2
15 cm
A radius of 0.25 m --what is diameter
0.5 m
What is pi? (Answer is NOT 3.14)
Ratio of circumference to diameter
If the area of a round table is 200.96 square feet, what is the radius of the table?
8 ft
A table has a distance around it of 150.72 inches. What is the table's diameter?
48 inches
What is the difference in area between a circle with a 10 ft radius and a circle with a 20 ft radius?
942 ft2
A radius of x feet--what is the diameter?
2x
What is circumference of a circle with a radius of 12 feet?
75.36 ft
Area of a circle = 314 ft2
What is the diameter?
D = 20 ft
I want to frost the top of a cake and wonder how much frosting I will need. If the diameter of the cake is 22 cm, how much area will the frosting need to cover?
379.94 cm2
What is the area of a circle that has a circumference of 56.52 km?
254.34 km2
A diameter of 25b--what is radius?
12.5b
If a circumference of a circle is 100 inches, what is the diameter? Round to the second decimal place.
31.85 inches
What is the area of a semi-circle with a diameter of 14 inches?
76.93 in2
The area of a circular paved lot is 530.66 yds2
What is the distance around the edge of the paved lot?
81.64 yds
If a circle is just enclosed inside a square that has side length = 10 ft, what is the area outside the circle and inside the square?
21.5 ft2