Estimate to mark points 0 and 1 above the number line, and, and below it. Use the squares below to represent fractions equivalent to 1 sixth using both arrays and equations.
1
1

A= r2 × 3.14 7x7 ↓ ↓ 49 × 3.14 = 153.86 → 153.9

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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.