Transcript Slide 1

General Mathematic
(HSC)
Introduction
Stage 6 - Year 12
Press Ctrl-A
©G Dear2008 – Not to be sold/Free to use
3.1 Calculating Trig Ratios (1/11)
You can use your calculator to find trigonometric ratios.
When finding the angle we need to show working
Example:
Sin θ = 0.649
Use
DMS or
θ = Sin-1(0.649)
o
’ ’’
= 40.4662o
o
= 40 27’ 58’’
Degrees
Minutes
Seconds
2
3.1 The Trigonometric Ratios (2/11)
α
Adjacent
Opposite
Hypotenuse
3
3.1 The Trigonometric Ratios (3/11)
β
Adjacent
Opposite
Hypotenuse
4
3.1 The Trigonometric Ratios (4/11)
o
Sin θ =
h
a
Cos θ =
h
o
Tan θ =
a
h
o
a
θ
S ome
0 ld
H ags
C an
A lways
H ide
T heir
0 ld
A ge
5