Asked by swendy
find the total external surface area of a cylinder open at the top having a radius of 21cm and height 120cm
Answers
Answered by
Reiny
Your surface consists of the circular base , and a rectangle whose length is the circumference of the base and the width is the height of the cylinder.
SA = πr^2 + 2πrh, r is the radius, h is the height
SA = πr^2 + 2πrh, r is the radius, h is the height
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