Mathematics for IGCSE & O level - Circle Theorems (Section 1 - No. 50)

Which statements are accurate about the properties of circle theorems?

Equal chords in a circle are equidistant from the center.

The angle in a semicircle is 90 degrees.

Tangents from an external point to a circle are unequal in length.

Opposite angles in a cyclic quadrilateral are supplementary.

Chords, semi-circle, and cyclic-quadrilateral properties are correct.