Difference between revisions of "1976 AHSME Problems/Problem 24"
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Therefore, the ratio of the area of <math>\odot K</math> to the area of <math>\odot M</math> is <math>\frac{\pi R^2}{\pi r^2}=\left(\frac{R}{r}\right)^2=\boxed{\textbf{(C) }16}.</math> | Therefore, the ratio of the area of <math>\odot K</math> to the area of <math>\odot M</math> is <math>\frac{\pi R^2}{\pi r^2}=\left(\frac{R}{r}\right)^2=\boxed{\textbf{(C) }16}.</math> | ||
+ | |||
+ | ~MRENTHUSIASM | ||
== See Also == | == See Also == | ||
{{AHSME box|year=1976|num-b=23|num-a=25}} | {{AHSME box|year=1976|num-b=23|num-a=25}} | ||
{{MAA Notice}} | {{MAA Notice}} |
Revision as of 07:55, 6 September 2021
Problem
In the adjoining figure, circle has diameter
; circle
is tangent to circle
and to
at the center of circle
; and circle
tangent to circle
, to circle
and
. The ratio of the area of circle
to the area of circle
is
Solution
Let and
be the radii of
and
respectively. It follows that the radius of
is
Suppose is the foot of the perpendicular from
to
We construct the auxiliary lines, as shown below:
In right
we have
and
By the Pythagorean Theorem, we get
In right we have
and
By the Pythagorean Theorem, we get
We equate the expressions for then simplify:
Therefore, the ratio of the area of
to the area of
is
~MRENTHUSIASM
See Also
1976 AHSME (Problems • Answer Key • Resources) | ||
Preceded by Problem 23 |
Followed by Problem 25 | |
1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 • 21 • 22 • 23 • 24 • 25 • 26 • 27 • 28 • 29 • 30 | ||
All AHSME Problems and Solutions |
The problems on this page are copyrighted by the Mathematical Association of America's American Mathematics Competitions.