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The problems you missed are listed below with answers and explanations.  Look over the explanation for each problem so you can understand why you missed it!

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A triangle only has 3 sides. A parallelogram has 4. Therefore a triangle can not be a parallelogram.

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A parallelogram has 4 sides.

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A square is a parallelogram - both sets of sides are parallel.

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A parallelogram has 2 sets of parallel lines. Because they are parallel, the distance between the 2 lines is the same at any given point. If that is true then the lines in between them must be congruent (if those lines were not parallel, then it wouldn't be true). And the same goes for the other set of lines. So a parallelagram has 2 sets of congruent lines.

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The diagonals of a parallelogram will bisect each other.

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With one diagonal drawn, the 2 triangles shown will be congruent. If you recall from the lesson on parallel lines, you could use transversals to prove that the angles across from each other are congruent, so the triangles would also be congruent by SAS.

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A parallelogram has 2 sets of congruent angles. This can be proven using transversals.

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The adjacent sides of a parallelogram are not parallel, it is the opposites sides that are parallel.

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The opposite sides of a parallelogram are parallel, this what makes it a parallelogram.

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The adjacent sides of a parallelogram are not congruent. The opposite sides of a parallelagram are congruent.

'; rightans[0] = 1; rightans[1] = 1; rightans[2] = 1; rightans[3] = 1; rightans[4] = 1; rightans[5] = 1; rightans[6] = 1; rightans[7] = 1; rightans[8] = 1; rightans[9] = 1; //-->