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Topic: 3-dimensional problem
Replies: 2   Last Post: Jun 20, 2006 7:45 PM

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Posts: 181
Registered: 12/4/04
3-dimensional problem
Posted: Jun 17, 2006 11:54 AM
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It's been a while, and I'm getting nowhere fast with this problem. Perhaps someone could lend me a hand, or at least point me in the right direction. This problem comes from the New York State Regents Exam in Solid Geometry, June, 1950, Part II, Question 22.

Triangle ABC has a right angle at C. Line segment AD is drawn perpendicular to plane ABC. Points E and F are the midpoints of line segments DC and DB respectively. Prove that line EF is perpendicular to the plane ADC.

Thanks in advance. Neal Silverman

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