Basic Concepts on Circles

The center of a circle is also an

interior point of the circle.

• FACT

• BLUFF

The endpoints of a radius are

points on the circle.

• FACT

• BLUFF

There exists a tangent that is

also a secant.

• FACT

• BLUFF

Two radii of a circle may form a

chord of a circle.

• FACT

• BLUFF

A radius is a chord of the

circle.

• FACT

• BLUFF

All chords are diameters, but

not all diameters are chords.

• FACT

• BLUFF

If the diameters of two circles

are of the same length, they are

said to be congruent.

• FACT

• BLUFF

The diameter is the longest

chord of a circle.

• FACT

• BLUFF

All radii of a circle are

congruent.

• FACT

• BLUFF

Every chord being a line

segment determines a secant.

• FACT

• BLUFF