Geometric Proofs

Directions: Using exactly five geometric markings to show that a quadrilateral is a square.

Hint

What kinds of markings do you count as an actual marking?

Answer

There are a few possible answers but one is having a square with four equal side lengths (four markings) and one right angle (one marking).

Source: Robert Kaplinsky

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One comment

  1. I also like marking any three right angles and any two consecutive sides.

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