Question

theorem 3 in quadrilateral​

Answer 1

Step-by-step explanation:

Theorem 3: A quadrilateral is a parallelogram if and only if the diagonals bisect each other. ... The definition of a parallelogram is that the opposite sides are parallel. In the second way we establish that the opposite sides are parallel, so we can use the definition to conclude that the figure is a prarllelogram.

Answer 2

Answer:

Theorem 3. Theorem 3: A quadrilateral is a parallelogram if and only if the diagonals bisect each other. ... The definition of a parallelogram is that the opposite sides are parallel.