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| Question | Answer |
| Circle | A closed figure with points that are the same distance from a point, called the center |
| How many letters is the center of circle named? | 1 |
| How many letters are the radius, the diameter and the chord? | 2 |
| Radius | A line segment that goes from the center of the circle to a point on the circle -- in other words, the radius is a line that goes halfway across the circle from or to the center. The radius is half the diameter |
| Diameter | A line segment going across the circle passing through the center point. It divides the circle into two equal parts -- called semicircles. The diameter is twice the radius |
| Chord | A line segment going all the way across the circle, but not passing through the center |
| How many degrees does a whole circle have? | 360 |
| How many degrees does a semicircle have? | 180 |
| Circumference | The distance around the outside of a circle |
| What is the greek letter pi equal to? | 3.14 or 22/7 |
| Irrational Number | A number that cannot be written as a simple fraction or as a decimal with a finite (limited) number of decimal places |
| What is the formula for finding the circumference of a circle? | Circumference = pi * diameter |
| What is the formula for finding the area of a circle? | A = pi * radius2 or A = pr2 |
| What happens if the diameter is not given? | The number given is the radius and you remembered that the diameter is twice the radius |
| What happens if you are given a diameter of a circle, before you can figure the area? | You must figure out what the radius is by dividing by 2 or thinking “what is half of the diameter?” |
| Cylinder | A 3-dimensional shape that has a circle as the top and bottom surface |
| What is the top to the bottom of a cylinder called? | Height |
| What is the formula for finding the volume of a cylinder? | V = p * r² * height or V = pr2h What you are doing is finding the area of a circle ( p * radius * radius), then multiplying that by the height. This will figure what would fit inside the cylinder. |
| How is the volume always measured? | Cubic units |
| Cone | A 3-dimensional figure with a circular base and sides that meet at a point |
| What is the formula for finding the volume of a cone? | Volume = 1/3 * p * radius2* height |
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