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A regular rectangle is a quadrilateral with 2 pairs of parallel sides, the pairs of parallel sides are the same length but they are different to the other pair of parallel sides. * * * * * The above definition is not specific enough: it could apply to any parallelogram. It is also a requirement that all its interior angles are right angles.
Consecutive angles are supplementary Diagonals bisect each other Opposite angles are congruent Opposite sides are parallel
Yes.
If you know the lengths of the sides, you can use the cosine rule. If you have information about other aspects of the triangle, then other formulae will apply.