Question

How many square centimeters of silver foil would Sally need to cover the model completely?

509

763.7

2036

2290.5

Answer 1

That's half a sphere, what's the formula to find a sphere's surface?

Answer 2

Area formula if you want.

Answer 3

i dont remember

Answer 4

\(4\pi r^2\)

Answer 5

ok

Answer 6

ooooooohhhhhh i get it

Answer 7

Yup, half the sphere = 4pi r^2 /2
and you add the plane circle and you should get the area of the chopped watermelon :)

Answer 8

Circle's area = \(\pi r^2\)

Answer 9

im getting 508.68

Answer 10

so do i put 509

Answer 11

509 is only the half of the sphere, you forgot to add the surface ;D

Answer 12

509 + pi * 9^2 = 763.47