1. ©G Dear2008 – Not to be sold/Free to use
General Mathematic
(HSC)
Further
Trigonometry
Finding Angles
Stage 6 - Year 12
Press Ctrl-A
©G Dear2008 – Not to be sold/Free to use

2. Finding Angles (1/3) 7m 3m θo Because we have o and h we must use Sin.
Sin θo =
θo = Sin-1( ) 3 7
Use
DMS or o ’ ’’ =
Degrees
= 25o 22’ 37’’
Seconds
Minutes

3. Finding Angles – (2/3) 5m θo 2m Because we have a and h
we must use Cos. h 5m 2 5 θo
Cos θo = a 2m
θo = Cos-1( ) 2 5
Use
DMS or o ’ ’’ =
Degrees
= 66o 25’ 31’’
Seconds
Minutes

4. Finding Angles (3/3) 3m θo 6m Because we have o and a we must use Tan.
Tan θo = 6m a
θo = Tan-1( ) 3 6
Use
DMS or o ’ ’’ =
= 26o 33’ 54’’