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Developing the Formula for the Volume of a Sphere - PowerPoint PPT Presentation


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Developing the Formula for the Volume of a Sphere. OR. =. +. Volume of a Sphere. Using relational solids and pouring material we noted that the volume of a cone is the same as the volume of a hemisphere (with corresponding dimensions)

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Presentation Transcript
slide2

OR

=

+

Volume of a Sphere

Using relational solids and pouring material we noted that the volume of a cone is the same as the volume of a hemisphere (with corresponding dimensions)

Using “math language” Volume (cone) = ½ Volume (sphere)

Therefore 2(Volume (cone)) = Volume (sphere)

slide3

OR

=

÷ 3

Volume of a Sphere

We already know the formula for the volume of a cone.

slide4

Height

BASE

Volume of a Sphere

AND we know the formula for the volume of a cylinder

slide5

=

÷ 3

2 X

=

Volume of a Sphere

SUMMARIZING:

Volume (cylinder)= (Area Base) (height)

Volume (cone)= Volume (cylinder)/3

Volume (cone)= (Area Base) (height)/3

AND2(Volume (cone)) = Volume (sphere)

slide6

2 X

=

r

h

r

Volume of a Sphere

2(Volume (cone)) = Volume (sphere)

2( ) (height)/3= Volume (sphere)

2()(h)/3= Volume (sphere)

BUT h = 2r

2(r2)(2r)/3 = Volume(sphere)

4(r3)/3 = Volume(sphere)

Area of Base

r2