The angle between a tangent and the radius at point of contact equals
__.
The angle between a tangent and the radius at point of contact equals 90∘
The angle between the tangent at a point on a circle and the radius at the point of contact is
The angle between a tangent at the point of contact and the radius of a circle is 170∘.
The tangent makes a _____ angle with the radius at the point of contact.