Warm Up 03.19.12Week 1

Section 10.1 Day

1

I will identify segments and lines related to circles.

Circle

⊙ p Circle P

P

Radius The distance from the center to a point on the circle.

Diameter The distance across the circle through the center.

Circles are congruent if they have the same radius.Rule 1

Diameters are twice the radius.Rule 2

Radius and diameter are both segments and measures.Rule 3

are radii of ⊙ Q.

All radii of a circle are congruent.Rule 4

a segment whose endpoints are points on the circle.Chord

are chords.

a chord that passes through the center.diameter

is a diameter.

a line that intersects a circle at two points.secant

Line j is a secant.

Line k is a tangent.

a line that intersects a circle in exactly one point.tangent

Ex 1

Diameter

Radius

Tangent

Chord

Tangent Circles

Concentric Circles

2 point Circles

Do :

Textbook Page 599, 9 – 35 all Assignment:

Ex 2

a.

b.