# C2 Trigonometery

tips on how to use the formulas and what to use them for

AQA C2

- Created by: unknown
- Created on: 30-04-12 22:03

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Trigonometry

The Sine Rule - used to find a missing ANGLE or LENGTH when we know a side and its

opposite angle

a = Sinb c

Sin A B = Sin C

Tip: You only need two of the ones above and if you want to find a length, put the small letter on

top, if you want to find an angle put the Sin on top

The Cosine Rule - used to find a missing ANGLE when we know all three sides or a missing

LENGTH if we know an angle and its two V sides

a2 = b2 + c2 - 2bcCosA

Tip: you can rearrange it but make sure the first and last letter are the same i.e. a2 and CosA above.

Also, the last bit needs to be done altogether (2bcCosA above)

Area of a triangle

1 abSinC

2

Tip: always label the angle you know as C

Converting between degrees and radians

360o = 2rads

Degrees to Radians (you want radians so put pi Radians to Degrees (you don't wants radians so

on top) put pi on the bottom)

180

= 180 =

Arc Length

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