Circles:
Vocabulary:
Center: The point directly in the middle of the circle; it is equidistant from all points on the circle
Chord: A line segment with 2 endpoints on the circle
Radius: A line segment with one endpoint in the center and one on the circle
Diameter: A line segment passing through the center of the circle with 2 endpoints on the circle
Angle: 2 rays that share a vertex in the center of the circle
Circumference: The distance around the outside of a circle
Chord: A line segment with 2 endpoints on the circle
Radius: A line segment with one endpoint in the center and one on the circle
Diameter: A line segment passing through the center of the circle with 2 endpoints on the circle
Angle: 2 rays that share a vertex in the center of the circle
Circumference: The distance around the outside of a circle
Equations to Know:
Radius = 0.5 x Diameter
Diameter = 2 x Radius
Pi = 3.14
Circumference = 3.14 x d (if diameter is known)
Circumference = 3.14 x 2 x r (if radius is known)
Diameter = 2 x Radius
Pi = 3.14
Circumference = 3.14 x d (if diameter is known)
Circumference = 3.14 x 2 x r (if radius is known)