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

3110 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

Write √5 ( √8 + √18 ) in the form a√10, where a is an integer, without using a calculator.


Billy buys 4 adult tickets at £15 each and 2 child tickets at £10 each for show. A 10% booking fee is added to the ticket price. 3% is then added for paying by credit card. Find the total charge for these tickets when paying by card


Alice will play 2 games of tennis against Bob. Alice’s chances of winning each game is 0.7. Work out the probability of Alice winning exactly one match.


How should I approach my GCSE maths paper?


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