Question

Find the surface area of a sphere with a diameter of 14 cm. Leave your answer in terms of pi
@Directrix

Answer 1

sphere, volume, radius = 7 cm, Radius is half of diameter. 14/2 = 7

Volume of Sphere:

V = 4/3 * π * r³

Answer 2

V = 4/3 * π * r³

V = 4/3 * π * 7³

Answer 3

In terms of π, remember.

Answer 4

i think i did it wrong

Answer 5

i got 343 and i didnt approximate the pi

Answer 6

I got (1372/3) π cubic cm

Answer 7

I think you cubed the 7 and did not multiply that times (4/3).
Try again.

Answer 8

yea i cubed it

Answer 9

What are the answer options? I don't think we are supposed to approximate 1372/3

Answer 10

457.3?

Answer 11

Answer options?

Answer 12

There has to be a pi.

Answer 13

A.1,219 m2
B.50,265 m2
C.181 m2
D1,307 m2

Answer 14

They approximated the improper fraction. Let me think.

Answer 15

(1372/3) π cubic cm = 457.3 π cubic meters.

HOLD ON: We did volume rather than Surface Area.

So, we have the right answer to the wrong question.

Answer 16

The answer we got is an option because the homework writer always includes the volume and surface area answers hoping that we will mess up and we did.

Answer 17

No worries. We will fix it.

Answer 18

sorry i put the wrong answer choices

Answer 19

196pi cm^2

Answer 20

I put the wrong formula.

Answer 21

Surface area of a sphere:

A = 4 * π * r²

Answer 22

A = 4 * π * 7²

Answer 23

I got 196π square cm.

Answer 24

What did you get?

Answer 25

the same

Answer 26

Is that one of the answer options?

Answer 27

yes

Answer 28

Sorry that I messed us up on that question.

Answer 29

no that was my fault but you did it before so that's how i got the answer