Use a geometric model to factor x2 - 6x + 8 by following
these steps

Step 1: Model the trinomial by placing tiles in the Product
section to form a rectangle at the top left

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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.