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

5287 Views

See similar Maths A Level tutors

Related Maths A Level answers

All answers ▸

When do you know to use integration by parts?


Differentiate ln(x)/x


Solve: x^2-7x+6=0


A general function f(x) has the property f(-x)=-f(x). State a trigonometric function with this property and explain using the Maclaurin series expansion for this function why this property holds. Write down the integral in the limits -q to q of f(x) wrt x


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:

© 2025 by IXL Learning