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

................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download