This question can be answered correctly only if you post the statement I's missing value.stubbornp wrote:24. If the area of triangular region RST is 25, what is the perimeter of RST?
(1) The length of one side of RST is .
(2) RST is a right isosceles triangle.
BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course
Redeem
Featured Course
Target Test Prep GMAT OnDemand
Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.
- 715+ score guarantee — highest in the industry (99th percentile)
- 52 chapters · 1,500+ lessons · 4,000+ practice questions
- 400 hours of video · 1,500+ instructor-led HD smartboard lessons
- 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
- 24/7 live support + weekly Zoom office hours with GMAT instructors
- TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
- 1,200+ flashcards + AI-powered study assistant & daily calendar
- OnDemand, LiveTeach & GMAT Bootcamp formats available
- Also: GRE, SAT Math & Executive Assessment courses
- MBA Admissions Consulting now available
- 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
- 200,000+ students served
- 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★
5.0
(559 reviews)
130-pt guarantee
$0 to start
then $127/mo
2-q24
Source: Beat The GMAT — Data Sufficiency |
statement 1:
Length of one side is 5 sqrt(2)
No information about the other sides,,,
Insufficient
statement 2:
RST is a right isosceles triangle
so RS=ST
Area=0.5*RS*ST
25 =0.5*RS^2
50=RS^2
RS=5sqrt(2)
ST=5sqrt(2)
RT^2=ST^2+RS^2
RT^2=(5*sqrt(2))^2+(5*sqrt(2))^2
RT^2=100
RT=10
Perimeter=RS+ST+RT
=5sqrt(2)+5sqrt(2)+10
=10+10sqrt(2)
Hence statement 2 is alone sufficient and the ans should be B
What is the OA?
Length of one side is 5 sqrt(2)
No information about the other sides,,,
Insufficient
statement 2:
RST is a right isosceles triangle
so RS=ST
Area=0.5*RS*ST
25 =0.5*RS^2
50=RS^2
RS=5sqrt(2)
ST=5sqrt(2)
RT^2=ST^2+RS^2
RT^2=(5*sqrt(2))^2+(5*sqrt(2))^2
RT^2=100
RT=10
Perimeter=RS+ST+RT
=5sqrt(2)+5sqrt(2)+10
=10+10sqrt(2)
Hence statement 2 is alone sufficient and the ans should be B
What is the OA?
