A parralleogram is a quadrilater so a shape with 4 sides that has equal opposites
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Opposite angles of a parallelogram are congruent.
That IS a parrallelogram!
Sine = Opposite divided by Hypotenuse Opposite is the side of the triangle opposite the angle (in this case the 90o angle). Hypotenuse is the side opposite the right angle in a right angle triangle. Therefore, Sine 90 = 1 because the opposite side and the hypotenuse are the same side, they are both opposite the right angle.
The side opposite the right angle is the hypotenuse.
The angle with the smallest measure is opposite the shortest side. Similarly, the angle with the largest measure is opposite the longest side.