Q: Why is a true-length line always parallel to an adjacent reference-plane line?

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The adjacent sidesof a rhombus are always congruent... that's one of the identifying factors. A rhombus has all sides congruent, opposite sides parallel, and bisecting diagonals.

No.

not always but they can be

No. They are parallel only in RIGHT prisms or RIGHT cylinders. However, they are almost always parallel for school level questions.

Yes.

Related questions

The adjacent sidesof a rhombus are always congruent... that's one of the identifying factors. A rhombus has all sides congruent, opposite sides parallel, and bisecting diagonals.

a kite does not have parallel sides . It also has 2 pair of sides which are of equal length which are adjacent to each other (not opposite each other - such a s in a parallelogram)

Are complementary angles alwys adjacent?

No.

not always but they can be

All quadrilaterals have diagonally adjacent angles.

always-

Yes - it always has exactly two parallel sides.

No. They are parallel only in RIGHT prisms or RIGHT cylinders. However, they are almost always parallel for school level questions.

Yes a rectangle is parallel because it has lines that are the same so they always will be parallel.

to me a quadrilateral always has parallel sides

always