Finding a Missing Angle of a Right Triangle

EXAMPLE #1

First: figure out what trig ratio to use in regards to the angle. Opposite and Adjacent

O,A means we use Tan!

Second: set up the tangent ratio.

Third: use the inverse key (2nd key).

x

27

33

33

27Tanx

3.3933

271

Tan

EXAMPLE #2 First: figure out what

trig ratio to use in regards to the angle. Opposite and Hypotenuse

O,H means we use Sin!

Second: set up the sine ratio.

Third: use the inverse key (2nd key).

x

4533

45

33sin x

2.4745

33sin 1

EXAMPLE #3 First: figure out what

trig ratio to use in regards to the angle. Adjacent and Hypotenuse

A,H means we use Cos!

Second: set up the cosine ratio.

Third: use the inverse key (2nd key).

x

4826

48

26cos x

2.5748

26cos 1