Triangles

 

If we know two sides, we can find the other one using pythagoras

 

1     2    3

A2+b2=C2

 

BUT!!

what if we only know 1 side, it cannot be done, we need the angle ( Ө theta)

 

How to work out - Calculator!

TO work out the opposite of angle

Sin(angle)=? x (length you have) = answer

 

sin Өxhyp=opp

 

Hyp=hypotunuse 

Opp=Opposite

 

To work out the Adjacent

 

cos(angle)=? x (length you have) = answer

 

TO work out the hyp

 

tan(angle)=? x (length you have) = answer

 

 

If we are given 2 sides but no angle, We can find the angel by doing the reverse process 

We use three new functions

Sin-1 Cos-1 Tan-1

Ratio to Ө sin-1

 

Sin-1

(opp)

[-----]

(hyp) 

 

Cos-1