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please help :) I don't know how to figure out the surface area of a cylinder?

Author : Sarah

Submitted : 2018-02-13 23:38:06    Popularity:     

Tags: surface  figure  cylinder  area  

For the ends, it's just the area of two circles. For the side, pretend you have cut it and spread it out, then it's like a rectangle. The height of the rectan

Answers:

For the ends, it's just the area of two circles.
For the side, pretend you have cut it and spread it out, then it's like a rectangle. The height of the rectangle is the height of the cylinder, and the width is the circumference of the circular base.

Area of a cylinder having diameter , d , length l will have surface area Al = pi d l ( in case of an open cylinder at both ends along the length; but in case of closed end cylinder at both ends it would have additional surface area of A2 = 2 pid2/4 = pid2/2 .
Thus for closed cylinder total surface area = A1 + A2 = Pi d l + pid2//2 , where pi = 22/7 - 3.143

2 ends and a side

Area of a circle is pi r squared so you need two of them
And the area of the side is the circumference times the height, which is 2 pi r times h

For radius r and height h :-
A = 2 π r ² + 2 π r h
A = 2 π r [ r + h ]

area of a cylinder is (2 pi r h) + (2 pi r2)



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