We know that
There are six important properties of parallelograms to know:
<span>1) Opposite sides are congruent (AB = DC and AD=BC).
2) Opposite angles are congruent (D = B and A=C)
3) Consecutive angles are supplementary (A + D = 180° and D+C= 180</span>°<span>).
4) If one angle is right, then all angles are right.
5) The diagonals of a parallelogram bisect each other.
<span>6) Each diagonal of a parallelogram separates it into two congruent triangles.
Part 1) </span></span><span>What is BC?
BC=AD-----------> BC=10 cm--------> by </span>Opposite sides are congruent
the answer Part 1) is BC=10 cmPart 2) <span>What is m∠BCD?
</span>m∠BCD=m∠DAB-----> m∠BCD=120°----> by Opposite angles are congruent
the answer part 2) is m∠BCD=120°part 3) <span>What is AB?
</span>AB=CD------> AB=5 cm----> by Opposite sides are congruent
the answer Part 3) isAB=5 cmPart 4) <span>What is EB?
EB=DE-----> EB=6.1 cm----> by </span>The diagonals of a parallelogram bisect each other.
the answer Part 4) isEB=6.1 cm
