Posted by ali on Friday, July 30, 2010 at 6:07pm.
A student has built a 20cmlong pinhole camera for a science fair project. She wants to photograph the Washington Monument, which is 167 m (550 ft) tall, and to have the image on the film be 5.0 cm high.

College physics  bobpursley, Friday, July 30, 2010 at 6:17pm
Are not there two similar triangles here..from the pinhole enveloping the monument on one side, from the pinhole enveloping the image on the other.
Using similarity,
5cm/167m=.2m/d
solve for d, the distance to the Monument.
I think I did this problem in the 8th grade, it is odd seeing it again.
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