CK12 - Geometry

6.

7. cm


8. No, if the parallel(and by definitionopposite)sidesof a quadrilateralare congruentthen the quadrilateral
   MUSTbe a parallelogram.Whenyou sketchit, the two othersidesmustalso be paralleland congruentto
   eachother(provenin a previoussection).


9. No, if the diagonalsof a trapezoidbisecteachother, then you havea parallelogram.We also provedthis
   in a previoussection.


10. We will use a paragraphproof.

Startwith trapezoid and midsegment.

Now, usingthe parallelpostulate,constructa line throughpoint that is parallelto. Labelthe new
intersectionsas follows: