2 Views

Question : The perimeter of two similar triangles $\Delta \mathrm{ABC}$ and $\Delta\mathrm{ PQR}$ are $60\;\mathrm{cm}$ and $36\;\mathrm{cm}$ respectively. If $\mathrm{PQ} = 18\;\mathrm{ cm}$, then $\mathrm{AB}$ is:

Option 1: $20\;\mathrm{cm}$

Option 2: $24\;\mathrm{cm}$

Option 3: $36\;\mathrm{cm}$

Option 4: $30\;\mathrm{cm}$


Team Careers360 2nd Jan, 2024
Answer (1)
Team Careers360 7th Jan, 2024

Correct Answer: $30\;\mathrm{cm}$


Solution : Given: The perimeter of two similar triangles $\Delta \mathrm{ABC}$ and $\Delta\mathrm{ PQR}$ are $60\;\mathrm{cm}$ and $36\;\mathrm{cm}$ respectively. The length of $\mathrm{PQ} = 18\;\mathrm{ cm}$.
Since the ratio of the corresponding sides of similar triangles is the same as the ratio of their perimeters.
$⇒\frac{\mathrm{AB}}{\mathrm{PQ}} = \frac{\text{Perimeter of $\Delta$ ABC}}{\text{Perimeter of $\Delta$ PQR}}$
$⇒\frac{\mathrm{AB}}{18\;\mathrm{ cm}} = \frac{60\;\mathrm{ cm}}{36\;\mathrm{ cm}}$
$⇒\mathrm{AB} = 30\;\mathrm{ cm}$
Hence, the correct answer is $30\;\mathrm{ cm}$.

SSC CGL Complete Guide

Candidates can download this ebook to know all about SSC CGL.

Download EBook

Know More About

Related Questions

TOEFL ® Registrations 2024
Apply
Accepted by more than 11,000 universities in over 150 countries worldwide
Manipal Online M.Com Admissions
Apply
Apply for Online M.Com from Manipal University
View All Application Forms

Download the Careers360 App on your Android phone

Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile

150M+ Students
30,000+ Colleges
500+ Exams
1500+ E-books