100 POINTS AND BRAINLIEST IF U ANSWER THIS QUESTION:what type of triangles are formed by the diagonal of a square and its sides

Right angles triangle

Yes, right angle triangles are formed by a diagonal of a square..

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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.