Download Trigonometry:

Trigonometry:
opp
sin A =
hyp
adj
cos A =
hyp
opp
tan A =
adj
Example 1
• Given c = 9
• A = 40 degrees;
• Find side b.
Answer:
• Identify the given with your
triangle.
Given A = 40
Hyp = 9
• Identify what you have to find.
• Adj ?
• Which trig ratio would we set
up?
Answer part 2 :
• Trig ratio
• Cos A = adj
•
hyp
• Cos 40 = b
9
b = 9*cos 40
b = 9(0.7660)
b = 6.89
Example 2:
• Given a = 5
• b= 4
• Find angle A
Answer to #2
Adj  4 Opp  5
5
tan x =
4
1 5
tan = 51.34
4
A= 51.34
For a right triangle, True Or False:
1.
2.
3.
4.
Sin (x) = cos (90 – x)
Cos (x) = sin (90 – x)
Tan (x) = tan (90 – x)
Tan(x) = sin (x)
cos (x)
Work for today:
• Investigate exact values and angles in
standard position.
• Complete p. 74 #1 to 4,
•
p. 75 to 76 # 6 to 16;
• pass in one copy per group, of what you
finish; everyone must complete as what you
don’t finish in class is homework!!!
• Problem solving is due Wed, June 8;
•