Question

PLEASE I NEED HELP...I'LL AWARD MEDAL.
Find The Length Of Arc AC. When The Central Angle Is 120 degrees and the radius is 10. (Use pi = 3.14) (The Correct Answer Should Be Rounded To 2 decimal places)

Answer 1

Did you give it a try yet?

Answer 2

Here's The Picture

Answer 3

Yes I did give a try but i got the wrong answer @phi

Answer 4

so can you help me out

Answer 5

what did you do?

Answer 6

i used the formula

Answer 7

please write it out.

Answer 8

and the formula is n degrees over 360 x 2 x pi x radius

Answer 9

this formula is from my program

Answer 10

yes. now fill in the numbers

Answer 11

yeah I did that and keep getting 20.94395102 and when i round it to 2 decimal places i get 20.94 and i enter that....it was wrong

Answer 12

just fill in the numbers. Don't simplify

Answer 13

n /360 x 2 x pi x radius

or
2*pi*r * n/360

pi is 3.14
what is r ?
what is n?

Answer 14

R is 10 and n is 120

Answer 15

aren't we doing arc AC?

Answer 16

yeah

Answer 17

@phi ???

Answer 18

what is n? (for arc AC)

Answer 19

do you see the little "box" that means "right angle"

Answer 20

yeah

Answer 21

how many degrees in a right angle ?

Answer 22

90

Answer 23

ok, you now have all the numbers. what do you get ?

Answer 24

so n is 90

Answer 25

yes. the "central angle" is 90º

Answer 26

so i got 15.70796327

Answer 27

they want you to use pi=3.14

Answer 28

i did

Answer 29

no, you used pi with more digits (that is how you got all those decimals)

Answer 30

so the answer is 15.7

Answer 31

right??

Answer 32

if you use 3.14 you get

2*10*3.14 * ¼ = 62.8/4 = 15.7

I would type in 15.70

Answer 33

i typed 15.7 and i got it right

Answer 34

ok

Answer 35

THANX!!!! @phi

Answer 36

notice if you use pi= 3.14159 you get
15.70796327
and when you round to 2 places you get
15.71
and the program will mark it wrong (it really isn't, but it wants you to use 3.14)

Answer 37

ok thanx