- #1

devildog6289

- 4

- 0

If the radius of shere 2 is four times the radius of shere 1, what is the ratio A2/A1 of the areas?

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- Thread starter devildog6289
- Start date

- #1

devildog6289

- 4

- 0

If the radius of shere 2 is four times the radius of shere 1, what is the ratio A2/A1 of the areas?

- #2

mukundpa

Homework Helper

- 524

- 3

Surface area of a sphere is 4 Pi R^2 and R2 = 4R1

- #3

devildog6289

- 4

- 0

thank you

and i have 1 more question,

what is the ratio V2/V1 of the volumes?

and i have 1 more question,

what is the ratio V2/V1 of the volumes?

- #4

young e.

- 64

- 0

devildog6289 said:thank you

and i have 1 more question,

what is the ratio V2/V1 of the volumes?

V1= 4/3 Π R1^3

V2= 4/3 Π R2^3

Π= PI

DIVIDE BOTH EQUATIONS:

V2= 4/3 Π R2^3

SINCE: R2= 4R1 THEN

V2= 4/3 Π (4R1)^3

V2= 4/3 Π*64*R1^3

CANCEL (4/3, PI & R1^3)

THEREFORE:

V2= 64

OR

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