Theorems dealing with Parallelograms

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High School Math based on the topics required for the Regents Exam conducted by NYSED. Theorems about Parallelograms: Opposite sides are congruent, Opposite angles are congruent, Diagonals bisect each other, consecutive angles are supplementary

Parallelograms
A video about the definition and some theorems of parallelograms.
A parallelogram is a quadrilateral with opposite sides parallel.
Theorem 1: Opposite sides are congruent.
Theorem 2: Opposite angles are congruent.
Theorem 3: Diagonals bisect each other. Parallelograms - 4 Theorems
Four theorems are demonstrated and proven
THEOREM 8.3
If a quadrilateral is a parallelogram, then its opposite sides are congruent.
THEOREM 8.4
If a quadrilateral is a parallelogram, then its opposite angles are congruent.
THEOREM 8.5
If a quadrilateral is a parallelogram, then its consecutive angles are supplementary.
THEOREM 8.6
If a quadrilateral is a parallelogram, then its diagonals bisect each other.