Question

A piece of circular bread has a diameter of 11 in.

What is the approximate area of this piece of bread?
Use 3.14 to approximate pi and round your answer to the nearest hundredth.

Answer 1

Do you know the formula for the area of a circle?

Answer 2

pi*r2?

Answer 3

Right. So, can you find radius from diameter?

Answer 4

let me do the math

Answer 5

Sure

Answer 6

could it be 69.08?

Answer 7

Hm, no, how did you get that?

Answer 8

11*3.14*2

Answer 9

So, the formula is pir^2

Answer 10

pi is 3.14

Answer 11

And r is half of diameter.

Answer 12

mmhmm...

Answer 13

So, the formula is 3.14*(5.5)^2

Answer 14

Do you see how I plugged that in?

Answer 15

yes so the answer is 34.54?

Answer 16

No. I think you are multiplying by 2 instead of squaring the number.

Answer 17

or is it 379.94?

Answer 18

oh

Answer 19

How are you getting those numbers?

Answer 20

298.25

Answer 21

Where are these numbers coming from? Can you show me step by step?

Answer 22

ok so 3.14*5.5=17.27*17.27 i really hate math i'm good at it

Answer 23

So, the order of operations says to do exponents before multiplication.

Answer 24

So, 3.14*30.25 is the first step.

Answer 25

ok

Answer 26

Then multiply.

Answer 27

94.985

Answer 28

Right :-) And round to the nearest hundreth.

Answer 29

95

Answer 30

No, that is rounding to the ones unit.

Answer 31

The hundredth's place is two places to the right of the decimal.

Answer 32

94.100

Answer 33

No, to the hundredth's place is 94.99
And what do you get for the unit?

Answer 34

95

Answer 35

sorry if stupidness is annoying you.

Answer 36

No, it's cool. I just want you to understand.