▬▬▬▬ஜ۩۞۩ஜ▬▬▬▬▬▬▬▬ஜ۩۞۩ஜ▬▬▬▬▬▬▬▬ஜ۩۞۩ஜ▬▬▬▬▬▬▬▬ஜ۩۞۩ஜ▬▬▬▬▬▬▬▬ஜ۩۞۩ஜ▬▬▬▬
The diameter of a right circular cylinder is 7 cm and its height is 12 cm. Find the cost of polishing
its (a) curved surface, (b) whole surface at 3 per sq cm.
Answers
Explanation:
Given: diameter of a right circular cylinder = 7cm & height = 12 cm
Solution:
a) We know that,
Curved Surface Area = pie× (d)×(h)
= (22/7 )×(7)×(12)
= 22×12 = 262 sq.cm
The cost of polishing its curved surface = 262×3 = 786 ( rupees).
b) We know that,
Whole surface area = pie× d×[( d/2) + h]
= (22/7)×7 ×[ 7/2 + 12]
= 22 ×[ 31/2]
= 11×31 = 341 sq.cm
The cost for polishing it's whole surface area = 341×3 = 1023 ( rupees). ANS.
Answer:
Friendship is a relationship of mutual affection between people. It is a stronger form of interpersonal bond than an association, and has been studied in academic fields such as communication, sociology, social psychology, anthropology, and philosophy.
Explanation:
padai tooh achi chal rahi hai pr....
online classes mai vo baat kaha hai
....
pr ess lockdown ki wajah sa bore hoyai Padha hai
aur apkai din kaisa chal raha hai lockdown mai