Trigonometry
8
Trigonometry (Continued)
description
Trigonometry. (Continued). C A H. S O H. T O A. What we know already!. O means theta. Hyp. opp. O. Adj. Find the missing length. Sin O = opposite hypotenuse Sin 30º = Y 15 0.5 = y 15 0.5 x 15 = Y Y = 7.5. 15. Y. 30°. - PowerPoint PPT Presentation
Transcript of Trigonometry
TrigonometryTrigonometry
(Continued)(Continued)
S O H
C A H
T O A
What we know already!What we know already!
O
opp
Adj
Hyp O means theta
Find the missing lengthFind the missing length
Y1530°
Sin O = opposite
hypotenuse
Sin 30º = Y
15
0.5 = y
15
0.5 x 15 = Y
Y = 7.5
Finding angles when you know the lengths
Finding angles when you know the lengths
What if we know the length and want to find the angle?What if we know the length and want to find the angle?
O
14cm
17cm
Tan O = opposite
adjacent
Tan O = 14
17
Tan O = 0.8235
Angle O = inv tan 0.8235
Angle O = 39.47º
Using the inverse button on your calculator, work out the following angles
Using the inverse button on your calculator, work out the following angles
1) Sin = 0.6421
2) Cos = 0.7254
3) Tan = 0.2125
4) Cos = 0.9564
5) Tan = 0.5
6) Sin = 0.86247)
Tan = 0.5724
8) Sin = 0.8
9) Cos = 0. 9847
10) Tan = 0.7464
Please copy the diagrams and find the missing lengths
Please copy the diagrams and find the missing lengths
Y
25
XA
X
6.2
A
BC
X
A 25 B
20
25
B
12AC
C
BC
30º
30
70º 40º
23º50
30º
45º
6.5
40º
1
2
3
4
5
6
7
8
