The perimeter of a right-angled triangle is 72 cm. The lengths of its sides are in the ratio 3 : 4 : 5 Work out the area of the triangle.

Draw the triangle - recognising that it is a right angled trianglefind the scale factoruse the formula: 0.5 x base x height = area To find the scale factor you must divide the total perimeter by the sum of the ratios: 72/(3+4+5) = 6Then substitute the scaled base and height into the formula: 0.5 x (4 x 6) x (3 x 6) = 216 cm2Note: remember to always put units (exam technique)

Answered by Stella C. Maths tutor

2453 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

5y + 1 = 3y + 13


Solve for simultaneous equations x +5y =9 and 3x + 2y =5.


What's the best way to work out any percentage of a given number, e.g. 63% of 450?


Solve the simultaneous equations 2x + y = 18 and x - y = 6


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