CK12 - Geometry

Step 3: Subtractthe volumeof the hole from the volumeof the entirecylinder.

Hereare the stepscarriedout. First,use the formulato find the volumeof the entirecylinder. Notethat since

, the diameterof the pipe,is cm, the radiusis half of the diameter, or cm.

Now find the volumeof the innerempty“hole”in the pipe.Sincethe pipe is inch thick,the diameterof the

hole is inchesless than the diameterof the outerpart of the pipe.

The radiusof the hole is half of or.

Now subtractthe hole from the entirecylinder.

Example 7

Find the solid volumeof this cinderblock.Its edgesare

cm thick all around.The two squareholesare identicalin size.

Find the volumeof the entiresolid blockfigure.Subtractthe volumeof the two holes.

To find the volumeof the three-dimensionalfigure: