Homework Help: geometry

Posted by Anonymous on Tuesday, August 23, 2011 at 5:28pm.

A dartboard consists of a circle inside a rectangle.

the diameter of the circle equals the width of the rectangle. if the length of the rectangle is 20 units and its area is 160 squares units, what is the approximate probability that a dart that lands inside the rectangle will also land inside the circle?

a) .05
b) .25
c) .13
d) .31

y?

geometry - Reiny, Tuesday, August 23, 2011 at 5:52pm
area of rectangle = 160
so width = 160/20 = 8

area of circle = π(4^2) = 16π

prob of hitting circle = 16π/160 = .314 , looks like d)
geometry - shelby, Tuesday, August 23, 2011 at 6:05pm
would a partially opened newspaper be a plane and would a woven threads in a piece of cloth be line .
also what would a satellite dish signal be .. line plane or point

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