Circle theorems
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Last updated 7:29 AM on 11/1/22
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9 Terms
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1
The angle at the centre of a circle is twice the angle at the circumference when both subtended by the same arc
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2
Every angle subtended at the circumference of a semicircle by the diameter is a right angle
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3
Angles subtended at the circumference in the same segment of a circle are equal
4
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4
The sum of the opposite angles of a cyclic quadrilateral is equal to 180*
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5
A tangent to a circle is perpendicular to the radius drawn to the point of contact
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6
Tangents to a circle from an external point to the points of contacts are equal
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7
The line joining an external point to the centre of the circle bisects the angle between the tangents
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8
A radius bisects a chord at 90* and 0 is the centre of the circle
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9
Alternate segment theorem
