march 4 and 5, 2009
TRANSCRIPT
In the figure above, EBCD is a square and AE=8. What is the area of EBCD?
860o
EA
B C
D
March 4, 2009
Trigonometry
tangent: ratio between the opposite side and the adjacent side
sine: ratio between the opposite side and the hypotenuse
cosine: ratio between the adjacent side and the hypotenuse
SOH CAH TOA
March 5, 2009xo yo
zo
B
D CAxo
Note: Figure not drawn to scale
In the figure to the right, AD =1 and DC=√3. What is the value of z?
(a) 15(b) 20(c) 25(d) 30(e) 35
35o
x
12 y
55o
A
B C
How do you find the value of x ?
Using Trigonometry
tan A = x 12
tan 35o = x 12
.1212.
12 tan 35o = x8.4 ≈x
35o
x
12 y
55o
A
B C
Would x be the same using ?
Using Trigonometry
tan C = 12 x
tan 55o =
x tan 55o = 12
12 xx x
tan 55o tan 55o
x ≈ 8.4
March 6, 2009
What is the perimeter of the figure below?
(a) 24(b) 25(c) 28(d) 30(e) 36
6
66
30o 30o