Transcript Trigonometry 2 Finding the angle when the sides are

Trigonometry 2
Finding the angle when
the sides are given
Reminder (The three rules)
O
S
A
H
C
O
H
T
A
Example 1
Step
the the
sides
Step12identify
substitute
you
havevalues
been given,
known
in to and
so
the
formula required
the
equation
5cm
3cm
x
Sin x= 3/5=0.6
Using your calculator
We need to find the solution to
Sin x=0.6
Depending on your calculator you do the following
0.6 2nd sin =36.87o
0.6 inv sin =36.87o
2nd sin 0.6= 36.87o
Sin-1 0.6 =36.87o
Example 2
This time we have the
adjacent and opposite
sides given
So tan x=9/4=2.25
Using the calculator
X=66o