A rectangle has an area of 20 cm2. Its length and width are enlarged by scale factor 3. Find the area of the enlarged rectangle.

Area of rectangle is 20 cm2. The new area of the enlarged rectangle is the original area, 20 cm2, times the area scale factor. We are only given the length scale factor, therefore, we need to work out the area scale factor. The area scale factor is the length scale factor times itself, in other words lsf x lsf. The length scale factor (lsf)is 3, substituting in the numbers, the area scale factor is 3 x 3, or 32 , =9.
The new area = original area x area scale factor
The new area = 20 x 9
The new area = 180 cm2 (don't forget the units)

PB
Answered by Paulina B. Maths tutor

3626 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

What is the Pythagoras Theorem?


The normal price of the pair of shoes is £28. In a sale the price is reduced by 35%. What is the new price of the shoes?


A bag has 3 red balls and 5 green balls. I take out 2 balls, without replacing them. What is the probability of choosing at least one red ball? Give your answer to 3 decimal places.


Jo wants to work out the solutions of x^2 + 3x – 5 = 0. Can the solution be worked out?


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