Can I say "annulus"?
Draw two concentric circles with different radii. Draw a chord
in the larger circle that is also a tangent to the smaller circle.
If the chord length is d, what is the area of the annulus (the
washer shape) between the two circles?
To enable consistent communication, use O for the centre of
the circle, T for the point at which the tangent touches the
inner circle, A and B for the ends of the chord and R and r for
the larger and smaller radii respectively.
in the larger circle that is also a tangent to the smaller circle.
If the chord length is d, what is the area of the annulus (the
washer shape) between the two circles?
To enable consistent communication, use O for the centre of
the circle, T for the point at which the tangent touches the
inner circle, A and B for the ends of the chord and R and r for
the larger and smaller radii respectively.
Labels: mathemagic, SharedPuzzle
posted by Chris at
11:23 AM
3 Comments:
The area of the washer is pi/4*d^2 is the tangent chord is d.
Try again...
The area of the washer is pi/4*d^2 IF the tangent chord is d.
Rats! That was too easy. I had a feeling that you or tha b....h wold get it.
I stumbled across that one when checking out Einstein's Sphere.
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