Advertisements
- 21. The inner circumference of a circular race track, 25 m wide, is 880 m. Find radius of the outer circle.
A.152m
B.156m
C.163m
D.165m
Answer & Explanation
Answer: Option D 
Let inner radius be r metres. Then, 2Πr = 880 ⇔ r = (880 x (7/44))= 140 m.
Radius of outer circle = (140 + 25) m = 165 m.
View Answer
- 22. If the radius of a circle is decreased by 50%, find the percentage decrease in its area
A.52.5
B.60
C.72.5
D.75
Answer & Explanation
Answer: Option D
Let original radius = R. New radius =(50/100) R = (R/2)
Original area=Π( R )2= and new area= Π((R/2)2= (Π( R )2)/4
Decrease in area =((3Π(R )2 )/4 X (1/Π( R)2) X 100) % = 75%
View Answer
- 23. In two triangle, the ratio of the areas is 4:3 and that of their heights is 3:4 the ratio of their bases is
A.16:9
B.9:16
C.9:12
D.16:12
Answer & Explanation
Answer: Option A
Given a1/a2 =4/3, h1/h2=3/4
also, we know that
a1/a2=(1/2×b1×h1)/(1/2×b2×h2)
on substituting in above equation, we get
b1/b2= 16/9
therefore b1:b2= 16:9
View Answer
To whom this Area Questions and Answers section is beneficial?
Students can learn and improve on their skillset for using Verbal Ability effectively and can also prepare for competitive examinations like...
- All I.B.P.S and Public Sector Bank Competitive Exam
- Common Aptitude Test (CAT) Exams
- UPSC Paper-II or CSAT Exams
- SSC Competitive Exams
- Defence Competitive Exams
- L.I.C / G.I.C AO and Clerk Competitive Exams
- Railway Competitive Exam
- University Grants Commission (UGC)
- Career Aptitude Test (IT Companies) and etc.