1. Mr. V’s wife bought some running shoes this weekend. They were on sale for $45, but they were $65 last week. What was the percent discount?

2. Estimate

3. Which side is opposite angle A?

• TOTD: adjacent

Warm-up 9/13 Pre-Calc

79

A

B

C

Warm-up 9/13 Bk. 31. Draw right triangle ABC

2. Draw parallel to

3. Draw the following figure: W is the midpoint of line segment .

• Term of the Day: Vertical Angles

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YZ

In case your notes don’t have this…

Sin =

Cos =

Tan =

opposite

hypotenuse

adjacent

hypotenuse

opposite

adjacent

…then write it down now

θO

H

A

Get into Trios

• Two contestants, One scorekeeper• The scorekeeper holds up the triangle and

asks for a side.– “What side is opposite angle A?”

• The two contestants must say TWO LETTERS– “RV!”

• After all four pages, then the winner plays the scorekeeper and the non-winner is the new scorekeeper.

For Example… M

R V

Nab ‘em

An exercise in speed and trigonometry

Here’s the deal…

• Get out a half-sheet of paper• You’ll see a triangle on the wall• I’ll call out a Sine, Cosine, or Tangent and

an angle.• The two contenders race to “Nab” the

correct numbers and put them into the red box

• You write on the paper the correct Trig Function and fraction

12

16

20B

A

Sin A=1220

Sin B=1620

3

7

9R

Q

Cos R=39

Tan R=73

5

9

11U

F

Tan U=95

θ

10

16

8

Sin θ =816

Tan θ = 8 10

2

14

15

WM

Tan M =14 2

416

13

G

Y

Cos G = 416

V18

7

13

P

Tan V= 713

L7

6

N

2

Cos N =67

ALISON• Before you leave today,

you will take a mini-quiz.

• Until then, work on ALISON

• Or else this guy will come after you.