Question

The area of circle D is 113.1 square meters. The area of sector ADB is 34.6 square meters.
Find the Radius of D, The Circumference of D, the measure of arc AB, and the length of the circle the arc does not contain.

Answer 1

Help if you can

Answer 2

do you can drawing it please ?

Answer 3

looks like that.

Answer 4

ok

so do you know formula of area of a circle ?

Answer 5

(pi)r^2 Right?

Answer 6

so make this pi*r^2 = area what you know and what can you calculi from that easy ?

Answer 7

pi =3,14 - yes ?

Answer 8

Yes

Answer 9

So work backwards then?

Answer 10

area what you know is 113,1 unit squares

formula area is pir^2 = A

3,14*r^2 =113,1 yes ?

Answer 11

Yes, so would I divide or subtract 3.14 from 113.1? Seems a bit confusing in this case. After that, I would root the answer?

Answer 12

For radius, anyway.

Answer 13

not subtract just divide by 3,14 both sides

Answer 14

yes for radius - make it and see what you get for radius - yes sure

Answer 15

After dividing, I got 36.02 and after rooting I got 6.002. Would the circumference then be 36.69?

Answer 16

Thank you for your help, I just figured it out :D