When should you use the sine rule and when should you use the cosine rule?

The sine rule can be used when we either know:a) the length of two sides A and B and an angle that is not the corner where A and B meetb) two angles and the length of one side
The cosine rule can be used when we know:a) all three side lengths orb) when we have the length of sides A and B and the angle of the corner where A and B meet

JB
Answered by Joseph B. Maths tutor

3469 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Solve 6x^2 > 3 - 7x


How would you differentiate a function such as 4x^3


Jake has a piece of string that is 126cm long. He cuts the string into 3 lengths with the ratio 4:3:2 . How long is each piece of string?


Factorise 5x^2 + 20x


We're here to help

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

MyTutor is part of the IXL family of brands:

© 2026 by IXL Learning