Question

The figure below shows a shaded circular region inside a larger circle:

A shaded circle is shown inside another larger circle. The radius of the smaller circle is labeled as r and the radius of the larger circle is labeled as R. On the right side of the image is written r equal to 2 inches and below r equal to 2 inches is written R equal to 5 inches.

What is the probability that a point chosen inside the larger circle is not in the shaded region?

84%

50%

42%

16%


help ill fan and medal please help

Answer 1

it just the ratio of the 2 areas

the large cirvcle is pi 5^2
the small circle is pi 2^2

so the probability p that it IS in the smaller circle is the ratio of areas

the probability that is NOT is simply 1-p

Answer 2

ok

Answer 3

so - do oyu have an answer?

Answer 4

give me a sec im doing that now also

Answer 5

im multiplying correct?

Answer 6

work out the ration of the 2 areas A/a

Answer 7

im not sure :/

Answer 8

What is the area A of the big circle (leave it in terms of pi)
What is the area a of the small circle (leave it in terms of pi)

Answer 9

pi is 3.14 so um.... give me a sec i think ...idk

Answer 10

never mind the value of pi - just leave it as pi in the answer

Answer 11

If you do not know how to work out the area of a circle radius 2 and a circle radius 5 then I'm afraid you need to go back and revise that before you can answer this question

Answer 12

look im just not good with areas alright its not my thing!

Answer 13

btw - I GAVE you the formula above

Answer 14

"the large cirvcle is pi 5^2
the small circle is pi 2^2"

Answer 15

so work out those values (BUT LEAVE pi in the answer)