John Tranter – Resources – GeoGebra

Q412
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John Tranter
Exterior angles of a regular polygon
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John Tranter
The interior angle sum of a polygon
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John Tranter
Angles in a quadrilateral add up to 360°
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Angles in a triangle add up to 180°
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John Tranter
Alternate angles are equal
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Corresponding angles are equal
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Vertically opposite angles are equal
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Angles on a straight line add up to 180°
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Angles at a point add up to 360°
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Tangents from an external point are equal in length.
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The the perpendicular bisector of a chord
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Equal chords are equidistant from the centre
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Opposite angles of a cyclic quadrilateral
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Angle between the tangent and a chord
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Angle between the tangent and the radius
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The angle in a semi-circle is a right angle
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The angles in the same segment are equal
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Angle at centre is twice angle at circumference
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John Tranter