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Geometry puzzles (contest style)
Questions at easy, medium and hard levels. Pick a level and get a fresh set every time, with instant feedback.
Learn it Look for hidden structure: rearrange pieces, use symmetry, and remember that sliding edges doesn't change a perimeter.
Example: Joining the midpoints of a 10 × 10 square makes a smaller square. What is its area?
- The 4 corner triangles fold in exactly onto the inner square.
- So the inner square is half the big one.
- $100 \div 2 = 50$.
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