Flashcards
Circles
Cards in this deck (21)
- 1CircleA closed figure with points that are the same distance from a point, called the center
- 2How many letters is the center of circle named?1
- 3How many letters are the radius, the diameter and the chord?2
- 4RadiusA 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
- 5DiameterA 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
- 6ChordA line segment going all the way across the circle, but not passing through the center
- 7How many degrees does a whole circle have?360
- 8How many degrees does a semicircle have?180
- 9CircumferenceThe distance around the outside of a circle
- 10What is the greek letter pi equal to?3.14 or 22/7
- 11Irrational NumberA number that cannot be written as a simple fraction or as a decimal with a finite (limited) number of decimal places
- 12What is the formula for finding the circumference of a circle?Circumference = pi * diameter
- 13What is the formula for finding the area of a circle?A = pi * radius2 or A = pr2
- 14What happens if the diameter is not given?The number given is the radius and you remembered that the diameter is twice the radius
- 15What 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?”
- 16CylinderA 3-dimensional shape that has a circle as the top and bottom surface
- 17What is the top to the bottom of a cylinder called?Height
- 18What 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. - 19How is the volume always measured?Cubic units
- 20ConeA 3-dimensional figure with a circular base and sides that meet at a point
- 21What is the formula for finding the volume of a cone?Volume = 1/3 * p * radius2* height
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- GED Geometry (Circles) Flashcards on Circles, created by Shyla2011 on 24/03/2014.
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- Shyla2011
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