Question

Help with a couple of questions
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Answer 1

Do you know what you are using for \(\pi \)?

Answer 2

22/7

Answer 3

that's what me teacher told me to use

Answer 4

pi r^2 = 314 2/7

solve for r

take pi to be 3.14

Answer 5

oh sorry i dddddidnt see the 22/7

Answer 6

it's ok

Answer 7

It's basically what @welshfella said, just plug it in like so:

\(\Large 314 \frac{2}{7} = \frac{22}{7} r^2 \)

Answer 8

So multiple both sides by the reciprocal of 22/7, what do you get?

Answer 9

99.9090909091

Answer 10

Try leaving it in fraction form, it'll be a bit easier

Answer 11

100

Answer 12

write 314 2/7 as an improper fraction then multiply by 7/22

314 2/7 =[ (7*314) + 2] / 7 = 2200 / 7

Answer 13

Yup, and yup, now you just have \(\Large 100=r^2\)

Now just find the square root.

Answer 14

10

Answer 15

@Luigi0210 10

Answer 16

Yup, nice job!

Now you can just check it to be sure:

\(\Large A=\frac{22}{7}r^2 \)

\(\Large A= \frac{22}{7}(10)^2 \)

\(\Large A = \frac{2200}{7} \)

Which is indeed \(\Large 314 \frac{2}{7} \)

:)

Answer 17

so 10 is the radius?

Answer 18

10 is radius @Luigi0210

Answer 19

Yup!

Answer 20

can you help with another quest

Answer 21

Sure, go ahead

Answer 22

^

Answer 23

I think breaking it up into two different shapes might help. I see a semi-circle and a square at the bottom, do you follow?

Answer 24

no clue bro never had done this in my life

Answer 25

i can skip this question it is extra credit

Answer 26

It's simple once you see what I mean, do you see the two shapes now?

http://prntscr.com/9dcm55

Answer 27

yes

Answer 28

All you have to do is add the areas of the two shapes:

\(\Large A=s^2 \) (for the square)

\(\Large \frac{1}{2}A=3.14r^2 \) (for the semi-circle)

Just plug in numbers and add them together:

\(\Large A= 8^2 \) (square)

\(\Large \frac {1}{2}A=3.14 (4)^2 \)

Answer 29

A=64 (square)
1/2 A=50.2

Answer 30

is the answer 114.2

Answer 31

@Luigi0210

Answer 32

yes looks good

Answer 33

ok thanks

Answer 34

welcome

Answer 35

can you help with this one?

Answer 36

@welshfella @Luigi0210

Answer 37

First find the radius by using the formula for the circumference:-

C = 2 pi r

then plug this value of r into the formula for the area

Area = pi r^2