• Google+ icon
  • LinkedIn icon
  • 669 views

To find an unknown angle:

cosA= b2+c2-a2

              2bc

To find an unknown length:

a2=b2+c2-2bc cosA

Natalie H. A Level Business Studies tutor, GCSE Business Studies tuto...

About the author

is an online GCSE Maths tutor with MyTutor studying at Exeter University

Still stuck? Get one-to-one help from a personally interviewed subject specialist.

95% of our customers rate us

Browse tutors

We use cookies to improve your site experience. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok