1. CHANGING NUMBERS
Change the following number to 36 by moving the position of only two lines.

2. DO NOW: Answer the questions.
Is CB a tangent? (AB = 30)
QS = 8, OU = 5. Find RT. (Tricky!)

3. Chord Rule part ● part = part ● part #1 #2
If two chords intersect in a circle,
the products of their segments are EQUAL.
part ● part = part ● part
EXAMPLE: Find x.
NOW TRY THESE ON YOUR OWN: Find x. #1 #2
x = 4
x = 4

4. Secant Rule “WO WO” RULE b ● a = d ● c #1 #2
The product of one whole secant and its outside part is EQUAL TO the product of the other whole secant and its outside part.
“WO WO” RULE
(whole ● outside = whole ● outside)
b ● a = d ● c
EXAMPLES: Find x. #1 #2
x = x = 20

5. Tangent/Secant Rule “T2 WO” RULE #1 #2
Because this rule involves TWO different special segments, you can think of this as the
The square of a tangent is EQUAL TO the product of the whole secant and its outside part.
“T2 WO” RULE
a2 = c ● b
(TANGENT2 = WHOLE ● OUTSIDE)
EXAMPLE: Find x.
NOW YOU TRY THIS ONE: Find x. #1 #2
x = 4
x = 6

6. GOOD JOB!!!
Remember, you will have a QUIZ over this material on FRIDAY…
So be ready!
QUIZ ON FRIDAY!