501 Geometry Questions

Congruent Arcs and Circles

Congruent circles have congruent radii and diameters. Congruent central
angles form congruent arcs in congruent circles.

Tangent and Secant Lines in Circles

A tangentis a ray or line segment that intercepts a circle at exactly one
point. The angle formed by a radius and a tangent where it meets a circle
is always right angle.
Note: Two tangents from the same exterior point are congruent.
A secantis a ray or line segment that intercepts a circle at two points.

A

B

D

O CRRB  RD

secant OB ^ OD

tangent

501 Geometry Questions