Question:
If the radius of a sphere is halved, by what fraction does its volume decrease?
यदि गोले की त्रिज्या आधी हो जाए, तो आयतन कितने भाग से घटेगा?
Options:
- a) ½
- b) ¾
- c) ⅞
- d) ⅔
- a) ½
- b) ¾
- c) ⅞
- d) ⅔
correct answer : c)
Explanation:
V=4/3πr³. New V=4/3π(r/2)³=V/8. Decrease=7V/8 = ⅞ of original.
नया V=V/8। घटाव=7/8 =⅞।