Mathematics for IGCSE & O level - Circle Theorems (Section 1 - No. 8)
If a tangent and a secant are drawn from an external point to a circle, how are they related?
They are parallel.
The tangent is always longer than the secant.
The tangent is always shorter than the secant.
They intersect the circle at different points.
Giải thích
A secant intersects a circle at two points, while a tangent touches at one point.