The main properties of a quadrilateral are:
1. Quadrilateral Definition: A quadrilateral is a polygon with four sides.
2. Sum of Angles: The sum of the interior angles of a quadrilateral is always 360 degrees.
3. Exterior Angles: The sum of the exterior angles of a quadrilateral is always 360 degrees.
4. Types of Angles: The angles inside a quadrilateral can be acute (less than 90 degrees), right (90 degrees), obtuse (greater than 90 degrees), or reflex (greater than 180 degrees).
5. Types of Quadrilaterals: There are various types of quadrilaterals, including rectangles, squares, parallelograms, trapezoids, rhombuses, and kites. Each type has specific properties and characteristics.
6. Diagonals: A quadrilateral has two diagonals, which are line segments connecting any two non-adjacent vertices. The diagonals of some quadrilaterals, such as rectangles and squares, are equal in length and bisect each other.
7. Opposite Sides: In a parallelogram, opposite sides are parallel and equal in length.
8. Opposite Angles: In a parallelogram, opposite angles are equal in measure.
9. Consecutive Angles: The sum of two consecutive angles in a quadrilateral is always 180 degrees.
10. Midpoint Property: In a quadrilateral, the line segment connecting the midpoints of two sides is parallel to the other two sides and equal in length to half of the sum of those two sides.
List the main properties of quadrilateral
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