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Give the angle property:
Angle at centre of circle is 2x angle at circumference

Give the angle property:
Angle in a semicircle is a right angle.

Give the angle property:
Angles on the same arc are equal.

Give the angle property:
Opposite angles in a cyclic quad add to 180°

Give the angle property:
Tangent and radius make a right angle.

Give the angle property:
Two tangents from a point to a circle are the same length.

Give the angle property:
Exterior angle of a cyclic quad is equal to the interior opposite angle.

Give the angle property:
Two radii form an isosceles triangle.

