Transcript Slide 1

Trigonometry
Formulae
Level 8
Grade B
If the two sides we are interested in are the
opposite and hypotenuse
And if you want to
calculate the length
of the opposite side
o
s
h
o = sin(x) x h
soh
If the two sides we are interested in are the
opposite and hypotenuse
And if you want to
calculate the length
of the hypotenuse
o
s
h
h = o ÷ sin(x)
soh
If the two sides we are interested in are the
opposite and hypotenuse
And if you want to
calculate the angle
o
s
h
sin(x) = o ÷ h
soh
If the two sides we are interested in are the
adjacent and hypotenuse
a
c
h
What are the 3 formulae?
cah
If the two sides we are interested in are the
adjacent and hypotenuse
a
c
h
a = cos(x) x h
cos(x) = a ÷ h
h = a ÷ cos(x)
cah
If the two sides we are interested in are the
opposite and adjacent
o
t
a
What are the 3 formulae?
toa
If the two sides we are interested in are the
opposite and adjacent
o
t
a
o = tan(x) x a
tan(x) = o ÷ a
a = o ÷ tan(x)
toa
o = sin(x) x h
sin(x) = o ÷ h
h = o ÷ sin(x)
o
s
t
h
a = cos(x) x h
cos(x) = a ÷ h
h = a ÷ cos(x)
o
a
o = tan(x) x a
tan(x) = o ÷ a
a = o ÷ tan(x)
a
c
h
sohcahtoa