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Mathematics 18 Online
OpenStudy (anonymous):

Find the probability that a randomly chosen point lies in the shaded region. Will attach picture(to the best of my ability)

OpenStudy (anonymous):

hold on

OpenStudy (anonymous):

don't need the picture it is the ratio of the shaded region to the total region

OpenStudy (anonymous):

If I give you measurements can you work me through that?

OpenStudy (anonymous):

find the area of the shaded region, find the area of the total region, take the ratio

OpenStudy (anonymous):

is the problem finding the two areas needed?

OpenStudy (anonymous):

Yes.

OpenStudy (anonymous):

ok well i pretty much suck at geometry, but i could try

OpenStudy (anonymous):

|dw:1456283828581:dw|

OpenStudy (anonymous):

Hard to type sorry

OpenStudy (anonymous):

The shaded region is the triangle at the bottom

OpenStudy (anonymous):

lord

OpenStudy (anonymous):

ok we can find that area no problem use pythagoras to find the missing side, then use one half base times height

OpenStudy (anonymous):

|dw:1456283996507:dw|

OpenStudy (anonymous):

let me know when you get x, hint, it is a whole number

OpenStudy (anonymous):

x = 15?

OpenStudy (anonymous):

yes

OpenStudy (anonymous):

so triangle is one half base times height, height is 15, base is 8 get ...

OpenStudy (anonymous):

60

OpenStudy (anonymous):

ok good now for the next region ...

OpenStudy (anonymous):

What would be it's formula? I don't even know

OpenStudy (anonymous):

break it up in to rectangle and triangle

OpenStudy (anonymous):

|dw:1456284266523:dw|

OpenStudy (anonymous):

area of rectangle is easy enough right?

OpenStudy (anonymous):

Yup, 12 * 8 = 96

OpenStudy (anonymous):

and so is the area of the triangle

OpenStudy (anonymous):

did you get 20 yet?

OpenStudy (anonymous):

Yup

OpenStudy (anonymous):

so total area is \[20+96+60\] whatever that is

OpenStudy (anonymous):

176

OpenStudy (anonymous):

So I would take 60 and divide that by 176 for the %?

OpenStudy (anonymous):

ok i believe you so \[\frac{60}{176}\]

OpenStudy (anonymous):

I got 34.09%

OpenStudy (anonymous):

if you like percents , ok

OpenStudy (anonymous):

Thanks!

OpenStudy (anonymous):

yw

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