Question

Just wanted to make sure I was right, I don't trust myself http://prntscr.com/i1rlzl

Answer 1

@Vocaloid

Answer 2

not quite

area = pi * r^2 = ?

Answer 3

r^2?

Answer 4

r is the radius

Answer 5

I kinda forgot

Answer 6

you are given radius = 4

calculate area = pi * r^2

Answer 7

50.24?

Answer 8

27*

Answer 9

the answers are written in terms of pi, so don't convert pi to a decimal, just use the pi symbol

Answer 10

Oh, well I don't have that type of calculator because it converts it to a decimal

Answer 11

area = pi * r^2

replacing r with 4 and leaving pi alone gives us 16 pi = your answer

Answer 12

Ohhhh, I thought they wanted me to multiply 16 with pi

Answer 13

My mistake

Answer 14

So this one is 25 http://prntscr.com/i1rx12

Answer 15

this time you are given circumference, not the radius

Circumference = 2 pi r, solve for radius

Answer 16

Radius is 5 I think

Answer 17

5 pi = 2 pi * r

solve for r

Answer 18

I forgot

Answer 19

think about what is being done to r on the right side and do the opposite

Answer 20

10?

Answer 21

r is being multiplied by 2 and multiplied by pi

so divide both sides by 2 and divide both sides by pi to isolate r.

Answer 22

So divide 2 by 2 and 2 by 3.14?

Answer 23

5 pi = 2 pi * r

divide both sides by 2, and divide both sides by pi

Answer 24

1 and 1.57

Answer 25

5 * pi / (2 * pi) = ?

Answer 26

6.28 and 15.7

Answer 27

what is pi/pi = ?

Answer 28

1

Answer 29

good, so (5*pi)/(2*pi) = 5/2

now, let's divide the other side

2*pi * r / (2*pi) = ?

Answer 30

You there?

Answer 31

Radius is 5, right?

Answer 32

no, the radius is not 5, we are still solving for the radius

Answer 33

5 pi = 2 pi * r

we divided by 2 pi on the left side to get (5/2)

now, we divide right side by (2 pi) to get the radius

(2 pi * r)/(2 pi) = ?

Answer 34

1.57 and 1.57 r?

Answer 35

I divided

Answer 36

2 pi/ 2 pi = 1

(2 pi * r)/(2 pi) = ?

Answer 37

you should only be providing one answer not two

Answer 38

Okay so 2 divided by 3.14 is 1.57, I don't quite understand what I'm suppose to do after that

Answer 39

notice how the 2pi/2pi cancel each other out? so (2pi r)/(2pi) = r

putting everything together we get r = (5/2)

calculate the area using this r value

Answer 40

Ohhh, thats how its written out okay 1

Answer 41

You there?

Answer 42

\(\color{#0cbb34}{\text{Originally Posted by}}\) @Vocaloid
notice how the 2pi/2pi cancel each other out? so (2pi r)/(2pi) = r

putting everything together we get r = (5/2)

*** calculate the area using this r value ***
\(\color{#0cbb34}{\text{End of Quote}}\)