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pls help me with these three questions

cerenetie  Mar 3, 2018
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 #1
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Volume of a cylinder  =   pi * r^2 * h

 

325 pi   =  pi * 5^2  * h      divide out pi

 

325  =  25 * h       divide both sides by  25

 

13 cm   =  h

 

 

For the second one...let's let the original dimensions   =  1  x 7

If the scale factor is 16:1   .....each dimension  in the actual house is 16 times as much...so the area is

 

7* 16   *   1 * 16  =

 

7 * 16^2    =  1792 ft^2

 

 

Last one

 

The diagonal is the hypotenuse of a right triangle and "12"  is the length of one of the legs......the other leg will represent the other dimension of the rectangle

 

So its length is

 

sqrt  ( 18^2  - 12^2)  =  sqrt (180)  

 

So   the perimeter is   2 (12 + sqrt (180)   )    =  50.83 in

 

 

cool cool cool

CPhill  Mar 3, 2018
edited by CPhill  Mar 3, 2018

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