Find the all the angles of a triangle with side lengths of 8cm, 11cm and 11cm.

Using the knowledge of a2 = b2 + c2 - 2bcCos(A)

Rearrange to aquire Cos(A) = (b2 + c2 - a2)/2bc

Then input the values to obtain the angles of 42, 69, 69.

AJ
Answered by Alexander J. Maths tutor

5098 Views

See similar Maths A Level tutors

Related Maths A Level answers

All answers ▸

If I had an equation with both 'x' and 'y' present, how would I find the gradient?


Show that Sec2A - Tan2A = (CosA-SinA)/(CosA+SinA)


How do we know the derivative of x^n


What is differentiation and how is it done?


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences