Circle theroms

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9 Terms

1
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Angle at the centre theorem

Angle at the centre is double that at the circumference

<p>Angle at the centre is double that at the circumference</p>
2
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Angles Subtended by Same Arc Theorem

Angle a is always the same

<p>Angle a is always the same</p>
3
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Angle in a semicircle

Is always 90 degrees

<p>Is always 90 degrees</p>
4
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cyclic quadrilateral

opposite angles add up to 180 degrees

<p>opposite angles add up to 180 degrees</p>
5
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Tangent angle

Forms a right angle with the radius

<p>Forms a right angle with the radius</p>
6
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Alternate segment theorem

Angle between a chord and a tangent is equal to the angle in the alternate segment

<p>Angle between a chord and a tangent is equal to the angle in the alternate segment</p>
7
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Tangents to a circle from a point

Equal in length

<p>Equal in length</p>
8
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Pependicular bisector to chord

Forms a right angle

<p>Forms a right angle</p>
9
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cyclic quadrilateral

opposite angles add up to 180 degrees

<p>opposite angles add up to 180 degrees</p>