Mathematics for IGCSE & O level - Circle Theorems (Section 2 - No. 18)
If two tangents are drawn from a point outside a circle, what is always true about their lengths?
They are parallel.
They intersect at the center.
They are equal in length.
They are perpendicular to each other.
คำอธิบาย
Tangents from an external point are equal in length.