Circles - SAT

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Geometry & Trigonometry

Circles

SAT

Math

Last updated 11:50 AM on 3/13/25
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8 Terms

1
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Equation of a circle

(x−h)2+(y−k)2=r2

2
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h and k in circle equation

(h,k) = center point

3
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Angle created when a tangent line intercepts radius of circle

90º angle (perpendicular)

4
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Measure of inscribed angle

½ of central angle

5
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Midpoint formula

((x₁ + x₂)/2, (y₁ + y₂)/2)

<p><span>((x₁ + x₂)/2, (y₁ + y₂)/2)</span></p>
6
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Distance formula

√(x2​−x1​)2+(y2−y1​)2

<p><em>√</em>(<em>x</em><sub>2</sub>​−<em>x</em><sub>1</sub>​)<sup>2</sup>+(<em>y<sub>2</sub></em>−<em>y</em><sub>1</sub>​)<sup>2</sup></p>
7
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Area of a circle

πr^2

8
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Circumference of a circle

2πr