total surface area of one rupee coin us ______
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hey mate here is ur ans
it is a small cylindrical structure
so it's total surface area will be
2πrh+2πr²
if u want to know how
2πrh came
then just open up the curved surface of the cylinder it forms a rectangle
so that the length is equal
to the circumference which is 2πr and the breadth is the height of the coin
so now area of rectangle
=l*b=2πr*h
and as the top and base are circles it is πr² each
it is a small cylindrical structure
so it's total surface area will be
2πrh+2πr²
if u want to know how
2πrh came
then just open up the curved surface of the cylinder it forms a rectangle
so that the length is equal
to the circumference which is 2πr and the breadth is the height of the coin
so now area of rectangle
=l*b=2πr*h
and as the top and base are circles it is πr² each
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