this is a cheat sheet for the annoying circles and stuff
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Diameter
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D = 2 × r
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Circumference
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C = 2 × π × r
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Area
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A = π × r2
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radius
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the distance from the center of the circle to its outer rim
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chord
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a line segment whose endpoints are on a circle
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diameter
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a chord that passes through the center of the circle. the length of the diameter is two times the length of the radius
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secant
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a line that intersects a circle in two points
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tangent
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a line that intersects a circle in exactly one point
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point of tangency
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the point where the tangent touches the circle
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(x-h)2+(y-k)2=r2
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h=the x axis, k= the y axis, and r =the radius
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example:
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(x-1)2 + (y+3) 2 =4
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radius=2
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center=(1,-3)
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major arcs
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arcs above 180
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minor arcs
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arcs below 180
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semicircle
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arc equivalent to 180
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arcs
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chords
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circles overview
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good luck friend:)
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you got this
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Cheatography n. The art of mapping complex subjects into clear, instantly navigable reference guides.
