Posted by Rayna on Saturday, March 19, 2011 at 12:25am.
1. the mystery shape has fawer than 3 lines of symmetry. 2. it has at least 1 pair of perpendicular sides. 3. it has at least 1 pair of parallel sides. 4. it has less than 1 obtuse angle.

Math  MathMate, Saturday, March 19, 2011 at 6:11pm
Try a rectangle with adjacent sides of different length.
1. the mystery shape has 2 (fewer than 3) lines of symmetry.
2. it has 4 (at least 1) pairs of perpendicular sides.
3. it has 2 (at least 1) pair2 of parallel sides.
4. it has zero (less than 1) obtuse angle.

Math  Rayna, Sunday, March 20, 2011 at 5:36am
I don't understand what you mean by try a rectangle with adjacent sides of different length.

Math  MathMate, Sunday, March 20, 2011 at 7:18am
"Try" because there may be more than one answer to this question. You have to be convinced that this is the right answer.
It may sound confusing, but the definition of a square is a rectangle with adjacent sides equal, therefore a square is a rectangle, which means that a rectangle can have adjacent sides equal (and becomes a square).
Think of the number of lines of symmetries of a square, and that of a rectangle (with adjacent sides of different lengths). See which one fits the first requirement.
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