circle formulas/equations
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Last updated 6:19 PM on 4/24/26
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10 Terms
1
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circumference
c = 2πr
2
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area
a = πr²
3
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equation of a circle
(x-h)² + (y-k)² = r²
4
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which way is standard to rotate? (counterclockwise or clockwise)
counterclockwise
5
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what are the two forms of angle measurement?
degree and radian
6
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arc length (degree)
s = x/360 ⋅ 2πr
7
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arc length (radian)
s = x ⋅ r
8
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area of sector (degree)
a = x/360 ⋅ πr2
9
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area of sector (radian)
xr2 /2
10
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