1.4 Angle Measure 1.5 Angle Relationships

10.3 Arcs & ChordsFirst & Last NameMarch 6, 2014______BlockThe endpoints of a chord are also endpoints of an arc.Theorem 10.2: In a circle or in congruent circles, two minor arcs are congruent if and only if their corresponding chords are congruent.

The chords of adjacent arcs can form a polygon.A polygon is inscribed in a circle if each of its vertices lie on the circle.A circle is circumscribed about a polygon if the circle contains all the vertices of the polygons.

2. The main veins of a snowflake create six congruent central angles. Determine whether the hexagon containing the flake is regular (all the sides and angles are congruent).

a.b. 3. Determine the measure of each arc of the circle circumscribed about the traffic sign.

Theorem 10.3: In a circle, if a diameter (or radius) is perpendicular to a chord, then it bisects the chord and its arc.

5. In circle T, ZV=1, and TW=13. Find each measure.XV

XY

Theorem 10.4: In a circle or in congruent circles, two chords are congruent if and only if they are equidistant from the center.

7. In circle D, CF=8, DE=FD, and DC=10. Find each measure.FB

BC

AB

ED

Exit Slip

Determine the measure of each arc of the circle circumscribed about the traffic sign.

a.

b.