Term
| The angle at the centre is twice the angle at the circumference. |
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Definition
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Term
| The angle in a semi-cicle is 90°. |
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Definition
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Term
| Angles in the same segment are equal |
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Definition
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Term
| Opposite angles in a cyclic quadrilateral add up to 180° |
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Definition
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Term
| The lengths of the two tangents from a point to a circle are equal |
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Definition
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Term
| The angle between a tangent and a radius in a circle is 90° |
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Definition
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Term
Alternate segment theorem:
The angle (α) between the tangent and the chord at the point of contact (D) is equal to the angle (β) in the alternate segment |
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Definition
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