Question

Stuck?

Answer 1

ready

Answer 2

you could use proportions to find C (the circumference)
9/135 = C/360

Answer 3

once you know C, you can find r using C = 2pi r

Answer 4

Well I ust solved for C and got 24

Answer 5

ok, next use
C = 2 pi r
you know C is 24
24 = 2 pi r
divide both sides by 2pi
or by 2
then by pi

Answer 6

well 24/2 is 12

Answer 7

12/pi is 3.82165

Answer 8

looks good
r= 3.82

Answer 9

units squared?

Answer 10

Here is the formula for the length of an arc of circle, where
s = length of the arc,
n = measure of central angle, and
r = radius of the circle.

\(s = \dfrac{n}{360^\circ}2 \pi r\)

You know s and n.
Plug in those values in the formula above and solve for r.

Answer 11

you are finding the length of a radius
that is the length of a "line" (not area)

Answer 12

in other words, just "units" (of distance)

Answer 13

OKay so just 3.82 units

Answer 14

yes. units for lengths, squared units for area (I remember a "square" has the shape of area)

Answer 15

BTW, the units are cm, since the arc length is given in cm.