How to test the twin paradox without using a spaceship

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- What is a parallelogram with 4 congruent angles?
- Are the consecutive angles in a parallelogram congruent?
- Is a rhombus a parallelogram with four congruent angles?
- Why if both pairs of opposite angles of a quadrilateral are congruent then the quadrilateral is a parallelogram. prove it?
- Are the opposite sides of a parallelogram congruent?
- Are consecutive angles of a parallelogram congruent?
- Is a parallelogram are opposite angles congruent?
- Are opposite angles congruent on any parallelogram?

- What is always true about a parallelogram - The Q&A wikiWhat is always true about a parallelogram? ... The statement two parallelograms are similar is always never or ... In a parallelogram consecutive angles are always?
- Theorems for Parallelograms - Oswego City School District ...- opposite angles congruent - consecutive angles supplementary ... the remaining properties regarding a parallelogram can be "proven" true and become theorems.
- Geometry: Always , Sometimes, Nevers flashcards | Quizlet... a kite is a parallelogram → sometimes, ... Always, Sometimes, ... then the adjacent angles formed must be congruent. true ...
- Consecutive angles of a parallelogram are always ...Consecutive angles of a parallelogram are ... of a parallelogram are always supplementary. True or ... angles are the pair of congruent angles ...
- G.G.38: Parallelograms: Investigate, justify, and apply ...3 Which statement is true about every parallelogram? 1) ... of two consecutive angles of a parallelogram are in ... angles in a parallelogram are congruent, ...