1. A group of rectangles with equal adjacent sides are squares;
2. A diamond with a right angle inside is a square;
3. Rectangles with diagonal lines perpendicular to each other are squares;
4. The rhombus with equal diagonal lines is a square.
Method for judging abnormality of block;
5. Diagonal lines bisect each other vertically, and equal quadrangles are squares;
6. A quadrilateral with four equal sides and a right angle is a square;
7. A quadrilateral with equal sides and diagonal lines is a square;
8. Parallelograms with equal diagonal lines and perpendicular to each other are squares;
9. A parallelogram with a right angle and a set of equal adjacent sides is a square;
10. A rectangle whose diagonal bisects an inner corner is a square;
1 1. Two groups of quadrangles with parallel opposite sides and perpendicular diagonal lines are squares;
12. Two sets of quadrangles with equal diagonals are squares.
In fact, you can write a lot, but there is absolutely no need for the landlord to remember so much. As long as the landlord can remember the common methods of judging the box, if he can't remember so much, he can remember one method:
A quadrilateral that is both a rectangle and a diamond is a square.
Edited in April 2020-65438+June.
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