How do you calculate the area of a triangle when the question tells you the length of all three sides but no angles?

  1. use the cosine rule to get angle A; cos(A) = (b2 + c2 - a2)/2bc2) Use '1/2 x a b x sin(C)' to get the area of the triangleNote: the side 'a' is the one opposite angle A
Answered by Tom H. Maths tutor

2492 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Washing powder is sold in two sizes: Bag 1 is 600 grams for £3.30. Bag 2 is 1500 grams and usually costs £9.60 but currently has 15% off. Which is better value?


There are 48 girls in a large cheerleading squad. The ratio of girls to boys in this squad is 8:3. How many boys are in the squad?


Expand and simplify (x+1)(2x+3).


Solve simultaneously 2x-y=2, 3x+2y=17 to calculate values of x and y.


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences