Be sure to answer all parts. the area of a telescope lens is 6.490 × 103 mm2. (a) what is the area in square feet (ft2)? enter your answer in scientific notation.

To answer this question, you need to understand how to convert a unit. In this case, the conversion would be milli meter to feet. Since it area(the unit is ^2), the conversion needs to be done twice.
The calculation would be:
(6.490^10^3 mm2) / (304.8mm/ft) / (304.8mm/ft) = 0.06985= 6.985* 10^-2 ft2

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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.