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.
คำอธิบาย
The tangent to a circle is at right angles to the radius at the point of contact.