ssc online exam test cgl

Exercise

"Success has many fathers, while failure is an orphan."
- (Proverb)
SSC CGL Tier 1 :: QA Test 9
Home » SSC CGL Tier 1 » QA Test 9 » General Questions - Discussion
1 . The diameter of two circles are 18 cm and 8 cm. The distance between their centres is 13 cm. What is the number of common tangents?
[ A ]    1 [ B ]    2
[ C ]    3 right [ D ]    None of These
Answer : Option C
Explanation :
Here, r1 = 9 cm and r 2 = 4 cm
r 1 + r 2 = 9 + 4 = 13 cm
and r 1 – r 2 = 9 – 4 = 5cm
Also, d = 13 cm
Here, d = r 1 + r 2
= 13 cm
Hence, two circles touch each other externally, so three total no of common tangents are three.
Workspace Report error
Write your comments here:
Name *: Email:

© 2014 - 2015 by ssconlineexam.com . All Rights Reserved | Copyright | Terms of Use & Privacy Policy

Contact us: info@ssconlineexam.com     Follow us on twitter!

 

DMCA.com Protection Status