TRIGONOMETRY - tandrageemaths
TRIGONOMETRY
FIRSTLY, YOU ARE GIVEN THESE FORMULAE IN THE EXAM, (
SO AS LONG AS YOU KNOW WHAT TO DO WITH THEM YOU
WILL BE FINE.
FINDING THE LENGTH OF A SIDE
EXAMPLE
EXAMPLE
FINDING THE SIZE OF AN ANGLE
EXAMPLE
-----------------------
SIN = OPP
HYP
COS = ADJ
HYP
TAN = OPP
ADJ
8cm
Sin = Opp
Hyp
(Sin40 = ?
8
(? = 8 x Sin40
(? = 8 x 0.643
(? = 5.14 cm
So
(
Here, we have an angle, the Opposite & the Hypoteneuse.
So it must be SIN
?
(
400
Tan = Opp
Adj
(Tan55 = 8
?
(? = 8.......
Tan55
( ? = 8.....
1.43
(? = 5.6 cm
So
(
Here, we have an angle, the Opposite & the Adjacent.
So it must be TAN
(
550
8cm
?
6cm
Tan = Opp
Adj
(Tan? = 6
8
(Tan? = 0.75
(? = 48.60
Here, we have an angle, the Opposite & the Adjacent.
So it must be TAN
So
(
This means that if you had known the angle, typed it into the calculator and then pressed TAN it would read 0.75.
So you need to REVERSE it.
SHIFT TAN
or INV TAN
will do that.
(
?0
8cm
Cos = Adj
Hyp
(Cos? = 6
9
(Cos? = 0.667
(? = 48.20
Here, we have an angle, the Adjacent & the Hypoteneuse.
So it must be COS
So
(
Use INV COS
or SHIFT COS
to get this.
9cm
6cm
(
?0
................
................
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