Mathematics for IGCSE & O level - Circle Theorems (Section 2 - No. 23)
Two tangents are drawn from an external point to a circle. What is true about the lengths of these tangents?
They are perpendicular to each other.
They are equal in length.
They are parallel to each other.
They intersect at the center of the circle.
解释
Tangents drawn from an external point to a circle are equal in length.