**Angle in a semi-circle**

The angle in a semi circle is 90°.

**Angle between a tangent and a radius of a circle**

The angle between a tangent at a point and the radius to the same point of a circle is 90°.

**Angle at the centre of a circle**

The angle formed at the centre of a circle by an arc is twice the size of the angle on the circumference formed by the same arc.

**Angles in the same segment**

Angles in the same segment of a circle are equal.

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