Radius
The diameter of a circle is 14 m. What is the radius?
7 m
The radius of a circle is 30 cm. What is the diameter?
60 cm
The diameter of a circle is 10 m. What is the circumference?
31.4 m
How many degrees in a full circle?
360
The diameter of a circle is 4 cm. How much space will six identical adjacent circles take up?
24 cm
The diameter of a circle is 392 cm. What is the radius?
196 cm
The radius of a circle is 94.5 mm. What is the diameter?
189 mm
The diameter of a circle is 5 cm. What is the circumference?
15.7 cm
Half of a circle is ____ degrees.
180
Who is Mr. O (circle legend)?
A Canadian math teacher who claimed to be a pro perfect freehand circle drawer, but really just told his students that as a fun story and eventually became really good at drawing circles through practice.
How do you find the radius given the circumference?
Divide the circumference by pi to get the diameter. Divide the diameter by 2 to get the radius, since the radius is half the diameter.
How do you find the diameter given the radius and given the circumference?
Multiply the radius by 2 since the diameter is double the radius. Divide the circumference by pi.
How can you find the circumference of a water bottle using a flat ruler?
Mark a point on the bottle and roll it in a complete circle along the ruler.
To make a quarter turn, how many degrees do we turn?
90
Pi is a letter of which language?
Greek
Seven identical circles are lined up side-by-side and take up 70 cm together. What is the radius of each circle?
5 cm
True or false. The diameter of a circle makes a 190 degree central angle.
False. The diameter is a straight line that makes a 180 degree central angle.
Which has a larger circumference: a circle with a radius of 8 cm or a circle with a diameter of 15 cm? Explain.
A circle with a radius of 8 cm has a diameter of 16 cm and will have a larger circumference.
A shaded central angle is 190 degrees. How many degrees is the non-shaded part of the circle?
170
A size 7 basketball has a circumference of 29.5 inches. Will it fit through a 9-inch-diameter net?
No. The basketball's diameter is 9.4 inches.
The circumference of a circle is 80.384 mm. What is the radius?
12.8 mm
The circumference of a circle is 399 cm. John estimates the diameter to be 133 cm. Explain whether this is a good estimate or not and find the answer to the tenths place.
Yes, because the circumference is approx. 3 times the diameter. 127.1 cm
Circumference = 3.14 x d
What is the second formula for circumference?
C = 2 x 3.14 x r
Kinsey takes a 60 degree slice of pie. This represents what simplified fraction of the pie?
1/6 of the pie
Name the first 6 digits of pi.
3.14159