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What is the approximate surface area of a cylinder that has a radius of 6 centimeters and a height of 15 centimeters?

 Aug 17, 2021
 #1
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What is the approximate surface area of a cylinder that has a radius of 6 centimeters and a height of 15 centimeters? 

 

Approximate?  3 times 12 is 36, then that times 15 which is 360 + 18 = 540

and then just a little more because pi is a little more than 3.  Call it 550 cm2.  

 

Calculated:  3.14 • 12 • 15 = 565 cm2

 

Hmmm, my approximation wasn't bad.  Not real good, but not bad. 

.

 Aug 17, 2021
edited by Guest  Aug 17, 2021
edited by Guest  Aug 17, 2021
 #2
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Two end caps        +      lateral surface area

    pi r^2 *2             +      pi * d * h

pi (6^2) * 2            +      pi * 12 * 15

pi ( 72 + 180)

791.68 cm2

 Aug 17, 2021
 #3
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How do you know those end caps aren't hemispherical? 

 

Guest Aug 17, 2021

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