Vocabulary
What is the name for the number 3.14?
Pi
What is the radius of a circle with a diameter of 24?
12
What is the diameter of a circle with a radius of 7?
14
31.4
What is the area formula for a circle?
pi*r2 (pi*r*r)
What goes from 1 edge of a circle to the other edge and passes through the center, cutting the circle in half?
Diameter
What is the formula (in terms of the diameter) for the radius of a circle?
r = d/2 or 1/2*d
What is the formula (in terms of radius) for the diameter of a circle?
2r
How do you find the circumference if only the diameter is given?
Multiply the diameter by pi.
What is the area of a circle with a radius = 10?
314
What goes from the center of a circle to one edge of the circle?
Radius
What is the radius of a circle with a diameter of 5?
2.5
What is the diameter of a circle with a radius of 1/2?
1
What is the circumference of a circle with a diameter of 10?
31.4
The radius of a circle is 5. Find the area in terms of pi.
25pi
What do you call the distance around the outside of a circle? (Bonus 100 - What is this called for other shapes?)
Circumference (Bonus = Perimeter)
What is the radius of a circle with a circumference of 2pi?
1
What is the diameter of a circle with a circumference of 31.4?
10
How do you find the circumference if only the radius is given?
Multiply the radius times 2 and then multiply that times pi.
What is the area of a circle with radius = 1?
3.14
What do you call the set of points that are all equal in distance (equidistant) from a center point?
A Circle
What is the radius of a circle with an area of 16pi?
4
What is the diameter of a circle with an area of 9pi?
6
True or false, the circumference of a circle with a radius = 1 is pi.
False
49pi