Cheatography
https://cheatography.com
this is a cheat sheet for the annoying circles and stuff
equations
Diameter |
D = 2 × r |
Circumference |
C = 2 × π × r |
Area |
A = π × r2 |
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terms
radius |
the distance from the center of the circle to its outer rim |
chord |
a line segment whose endpoints are on a circle |
diameter |
a chord that passes through the center of the circle. the length of the diameter is two times the length of the radius |
secant |
a line that intersects a circle in two points |
tangent |
a line that intersects a circle in exactly one point |
point of tangency |
the point where the tangent touches the circle |
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graphing circles
(x-h)2+(y-k)2=r2 |
h=the x axis, k= the y axis, and r =the radius |
example: |
(x-1)2 + (y+3) 2 =4 |
radius=2 |
center=(1,-3) |
arcs- the basic
major arcs |
arcs above 180 |
minor arcs |
arcs below 180 |
semicircle |
arc equivalent to 180 |
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other sources
arcs |
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chords |
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circles overview |
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good luck friend:) |
you got this |
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