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Cos A =

Diagram for question: Cos A =
  • 0.6
  • 0.8
  • 1.2
A

andyrhcp104 asked · 12 Jun 2015

How can you work this out without a calculator?

Community Comments (3)

P
PART66Online 12 Jun 2015
Hi.

Cos A = Adjacent / Hypotenuse.
Cos A = 4 / 5
4 / 5 = 0.8
I think 4 / 8 is not very difficult to calculate without calculator. :)
A
andyrhcp104 12 Jun 2015
Of course, thanks I was thinking about it too hard.
A
aerorodder1 19 Dec 2015
Sohcahtoa...(Soh) (cah) (toa)
CosA=adj/hyp, (c=4/5),cah= .8
SinA=opp/hyp, (S=3/5),Soh= .6
TanA=opp/adj, (t=3/4),toa= .75

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