Warm up

o

3­31

The average temperature in DC is 56 , with  o temps reaching as high as 98  and as low as 14 Sketch a graph of this and then write a cosine  function describing it. y = a*cos(bx)+d

o

.  

  J      F      M      A     M      J        J      A     S      O     N     D

1

The area  of a  Triangle 2

Recall from geometry... 1 A=   b*h 2

h

b 3

Ex: 6

17

Ex: 3.0

1.6

5.2 4

Any side can be your base, as long  as you use the correct height.

5

What if the height's not given, but an angle is?

c

A

h b

6

1 Area=   bc*sin(A) 2 Note: The only thing that matters is that  angle A is in between sides b and c.

Ex:

14

42 o

15

7

What if you only have sides given? c

Heron's Formula:

a b

a+b+c where s=      2

Area =  √s(s­a)(s­b)(s­c) 8

Ex:

53

43

72

9

Depending on what you know, you can use  any of these formulas to get the correct  answer....

1 A=   b*h 2 1 Area=   bc*sin(A) 2

Area =  √s(s­a)(s­b)(s­c)

10

Homework #27 p.512 # 23, 27 p.519# 17­22, 34

11

Warm up

Sketch a graph of this and then write a cosine function describing it. J F M A M J J A S O N D y = a*cos(bx)+d. Page 2. 2. The area of a. Triangle. Page 3. 3.

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