Mathematics for IGCSE & O level - Circle Theorems (Section 2 - No. 32)
What is the relationship between a tangent to a circle and the radius drawn to the point of contact?
They are parallel.
They are perpendicular.
They are equal in length.
They form an acute angle.
Giải thích
The tangent to a circle is at right angles to the radius at the point of contact.