Today's class

Today we started our class cheking the homework and with the correction of some exercises of the test. After that we moved on with the content. We started Angles and Arcs.

Central Angle: angle whose vertex is the center.

Sum of the central angles: 360

ARCS

Minor Arc: arc AB

Major Arc: arc ACB or major AB

Semicircle:

Tips:

Measure is different than length.

Measure of the arc: central angle.

Length of an arc: l= central angle x C

360

Postulate 9-1: Arc addition postulate.

This postulate is similar to the segment addition postulate. If you add two arcs, it will give you one whole arc.

arc AB + arc BC= arc AC

Concentric circles: Concentric circles are circles that share the same center

Congruent Circles: They have the same r

All circles are similar.

Congruent Arcs: Arcs with the same length.

We don't have any homework for tomorrow.