I saw a book that features this problem here - it is a geometry problem that stumped the nation!
This looks just like a regular sophomore high school geometry problem... and I admit defeat after spending half an hour or so. The equations formed... just don't give enough information?!
Even some NASA scientists can't do this!
I didn't bother to follow the solution on the book that I can't come up with myself either.
But the brainteasers in the book... I got instantly turned off on the first one.
Question: Two U.S Coins adds up to 30 cents. One of them is not a nickel. What are the 2 coins?
Answer: One nickel and One quarter. Look, just one of them is not a nickel, but the other one is. Duh. I am not reading further.
3 comments:
What will carpenters do in this situation? They'd measure it.
Get out the protractor and measure it. If it's too big? take a picture and measure that. That's the correct way to "solve" problems.
Brainteasers are pointless and uninteresting.
That is exactly the thing that turn off many children their interest in mathematics - a huge disservice.
Note: Geometry and trig tricks only work for right triangles and parallel lines.
You need to know alternate, corresponding, vertically opposite angles, sum of angles of a triangle, isosceles triangle and MOST important the theory on congruent triangles. With these knowledge you can try after constructing a few useful lines.
You need to know alternate, corresponding, vertically opposite angles, sum of angles of a triangle, isosceles triangle and MOST important the theory on congruent triangles. With these knowledge you can try after constructing a few useful lines.
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