Quadrilateral RSTU has vertices at RS T ( 1,11) , (9,12) , (13, 5) and U (2, 2) .Show that the diagonals of RSTU are perpendicular. ults

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.