In a triangle ABC, side BC = 8.1 cm, side AC = 7 cm, and angle ACB = 30 degrees. What is the area of the triangle?

Initially, one might think to use area = 1/2 x base x height, however drawing the triangle immediately shows that this is not possible here. We then think to use the formula for area using two adjacent sides and the angle inbetween. Looking at our triangle we realise that it is of the correct form. The formula we need to use is = 1/2absinC.In this case, a = 8.1, b = 7, C = 30 degrees, and inputting this into the formula, using that sin30 = 1/2, we get: area = 1/2x8.1x7x1/2 = 14.175.

Answered by Ellie B. Maths tutor

3102 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Find an expression for the nth term of the following sequence: 7, 11, 15, 19


GCSE Maths - Solve the equation (2x+3)/(x-4) - (2x-8)/(2x+1) = 1 Give your answer to 2 decimal places.


How to solve problems with discount applied twice in the same product?


Given the curve y=x^2 +1 and the line y=k, find, using graphical methods only, the value of k for which there is exactly one solution.


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