Question

Medal and fan!

Answer 1

What's your question?

Answer 2

Circle A has a diameter of 9 inches, a circumference of 28.26 inches, and an area of 63.585 square inches. The diameter of circle B is 5 inches, the circumference is 15.70 inches, and the area is 19.625 square inches..

Part A: Using the formula for circumference, solve for the value of pi for each circle. (4 points)

Part B: Use the formula for area and solve for the value of pi for each circle. (4 points)

Part C: What observation can you make about the value of pi for circles A and B? (2 points)

Answer 3

@k_lynn @ElonaSushchik

Answer 4

Whats ur answer??

Answer 5

I don't know what equation I need to use for Part A. @ElonaSushchik

Answer 6

I believe I solved part A now to solve part b...

Answer 7

Using the formula for circumference, solve for the value of pi for each circle.

C = pi * d where d is the diameter of the circle.

Circle A:

C = pi * d

28.26 = pi * 9

pi = 28.26/9

@swagswagswagswagswag1 What is 28.6 divided by 9? Post what you get, okay?

Answer 8

3.14

Answer 9

I have solved part A I just need to work on part B now.

Answer 10

Look, the idea here is to pretend that you do not know the value of pi and then to solve for it.

Answer 11

I got 3.17 for 28.6 divided by 9.

Answer 12

You are right what do I do now?

Answer 13

Circle B:

C = pi * d

15.70 = pi * 5

pi = 15.70/5 @swagswagswagswagswag1 What is 15.70 / 5

Answer 14

3.14?

Answer 15

Yeah

Answer 16

So what do I do for Part B?

Answer 17

@Directrix

Answer 18

@animal_lover36

Answer 19

@Directrix Thanks for helping this kid!

Answer 20

Use the formula for area and solve for the value of pi for each circle.

A = pi*r^2

Circle A:

A = pi*r^2

63.585 = pi* (4.5)^2

pi = 63.585 / (4.5)^2

pi = ? @swagswagswagswagswag1

Answer 21

3.14!?!

Answer 22

Then, we do the same type calculation for Circle B.

So, crank out the answer for circle A so that we can move on, okay?

Answer 23

@Directrix

Answer 24

And b is 3.14 as well

Answer 25

@Directrix

Answer 26

Correct. Now, I am wondering about the 3.1777 I got in Part A. I will check it. Meanwhile, you do this:

Circle B:

A = pi*r^2

19.625 = pi* (2.5)^2

pi= 19.625 / (2.5)^2

pi = ? @swagswagswagswagswag1

Answer 27

Answer is 3.14

Answer 28

Right.

Answer 29

So what about part c?
And the answer you got in part a?

Answer 30

What observation can you make about the value of pi for circles A and B?

Answer 31

Was the answer you got in 3.177 correct?

Answer 32

3 out of the 4 answers are 3.14

Answer 33

On three of the 4 calculations, we got 3.14.

You got 3.14 on all 4 but I am not sure you calculated all of them or just wrote 3.14.

Answer 34

Can you help me with 1 more?

Answer 35

We will re-visit the problem where I got the 3.17777. Note that I posted all my work so you could check it.

We are not finished with this one yet.

Answer 36

A candy bar box is in the shape of a triangular prism. The volume of the box is 2,400 cubic centimeters.

Part A: What is the height of the box? Show your work. (5 points)

Part B: What is the approximate amount of cardboard used to make the sides of the candy box? Explain how you got your answer. (5 points)

Answer 37

You're calculations were correct for Part A on the first one (3.177) so what should I write?

Answer 38

C = pi*d
28.26 = pi* 9
pi = 28.26/9 = ?

Answer 39

This time, I'm getting 3.14 for pi.

Answer 40

Okay so did I. Shall I go with 3.14 then?

Answer 41

What observation can you make about the value of pi for circles A and B?

It is is equal to 3.14.

Answer 42

@ElonaSushchik Glad to do it.