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In any right triangle, the sine of an angle x is the length of the opposite side (O) divided by the length of the hypotenuse (H). In a formula, it is written as 'sin' without the 'e':
Short answer: No! <<=====
If the two are one after another, then they are not supplementary, which a parallelogram requires.
If they are in opposite corners, they must be equal. That's another property of parallelograms.