<PRE><B>Question 627805</B>
25 cent - a quarter is 3/4 inch in diameter.
 When placed 7 feet from eye, it blocks the disc of moon. Diameter of the moon is 2160 miles. How far is the moon from the earth?
;
Using the rule of similar triangles
:
Convert 7 ft to 84 inches
let d = distance to the moon
:
A ratio equation
{{{d/2160}}} = {{{84/.75}}}
Cross multiply
.75d = 2160*84
d = {{{181440/.75}}}
d = 241,920 miles to the moon
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