Question

Explanation Please

Answer 1

Find the surface area of a sphere with a circumference of 86 cm. Round to the nearest tenth. (1 point)2,354.2 cm2
1,177.1 cm2
187.3 cm2
13.7 cm2

A balloon has a circumference of 16 cm. Use the circumference to approximate the surface area of the balloon to the nearest square centimeter. (1 point)804 cm2
326 cm2
256 cm2
81 cm2

Answer 2

@Noemi95

Answer 3

I just realized this isnt in the math section sorry . lol

Answer 4

:P

Answer 5

I do not know the answer

Answer 6

these r two diff questiens i think

Answer 7

Yes.

Answer 8

2454 ithink for 1st

Answer 9

what do you think noemi

Answer 10

81 for second

Answer 11

its right ive checked

Answer 12

okay thank you lol

Answer 13

that is not a answer choice

Answer 14

why lol? :)

Answer 15

isnt it serious

Answer 16

Remember that the formula for the surface of a sphere is:
S=4(pi)r^2
[We don't know what the radius is, but we are given the circumference]
Circumference is 2(pi)r
Your formula will be C=(2)(2.14)(r)
Then multiply (2)(2.14)
then divide the circumference to the result and you find 'radius'

Answer 17

meant 3.14 for pi! >.<

Answer 18

I multiplied 2*3.14 and got 6.28, what do I divide or do know ?

Answer 19

You now divide the circumference by that
86/6.28=13.69

Answer 20

none of the answer choices are that

Answer 21

that's not the answer yet, we just found the radius.
Now plug in Values in the actual equation we need to solve
S=4(pi)r^2

Answer 22

4*3.14*13.69^2 ?

Answer 23

yes!

Answer 24

the first answer would be correct .

Answer 25

That's what I thought so(:

Answer 26

Can you also help me with the other one .

Answer 27

Yes, let me see what it says

Answer 28

We would pretty much use the same method, since a balloon is also a sphere because is 3D

Answer 29

Again, to find the radius we divide the circumference by 2(pi)=6.28
So, 16/6.28=2.547
Now, plug in known values into the formula for surface "S=4(pi)r^2"
S=(4)(3.14)(2.547^2)

Answer 30

81

Answer 31

Excellent!(:

Answer 32

Find the similarity ratio of a prism with the surface area of 81 m2 to a similar prism with the surface area of 361 m2. (1 point)6,859 : 729
9 : 19
19 : 9
729 : 6,859

Answer 33

sqrt(361): sqrt(81)

= B. 19: 9

Answer 34

waiitt! it's truly B. but the 9:19 one

Answer 35

19.9 is correct

Answer 36

are asking me, or telling me? haha

Answer 37

asking

Answer 38

No, it's 9:19

Answer 39

okay

Answer 40

because they're asking the similarity ratio of 81 to 361 (small # first)

Answer 41

If the scale factor of two similar solids is 3 : 14, what is the ratio of their corresponding areas? What is the ratio of their corresponding volumes? (1 point)The ratio of their corresponding areas is 27 : 2,744.
The ratio of their corresponding volumes is 9 : 196.
The ratio of their corresponding areas is 9 : 196.
The ratio of their corresponding volumes is 27 : 2,744.
The ratio of their corresponding areas is 6 : 28.
The ratio of their corresponding volumes is 9 : 42.
The ratio of their corresponding areas is 3 : 196.
The ratio of their corresponding volumes is 3 : 2,744.

Answer 42

To find the corresponding areas we would use "a^2: b^2"
and to find the corresponding volumes we would use "a^3: b^3)

Answer 43

areas = 3^2: 14^2
volumes= 3^3: 14^3

Answer 44

can you figure it out on your own now? (:

Answer 45

would it be 27 2744 ?

Answer 46

yes, that would be for the VOLUME!

Answer 47

okay thanks . answer 1 well A would be my answer ?

Answer 48

no, because for answer A, for the values of Volume they have different numbers.

Answer 49

4 ?

Answer 50

Let me work it out with you. For
AREA: 3^2: 14^2
9: 196
VOLUME:3^3: 14^3
27: 2744

Answer 51

okay

Answer 52

So, the answer would be "B", Notice that each answer choice has two-lines of info.

Answer 53

okay thank you

Answer 54

No problem Lexi.

Answer 55

plz @lexiamee mention that u want ans or explanation