Aladder is leaning up against a 70-foot wall at an angle of elevation of 38°. how far is the foot of the ladder from the wall? round your answer to the nearest tenth of a foot.

The ladder, floor and wall form a straight triangle. The angle between floor and wall is obviously 90, between floor and ladder is 38 (given), so the angle between wall and ladder must be (180-90-38 = 52).

The law of sines says that the side length divided by the sine of the opposite corner is a constant for all three corners.

Let's say the floor length is f.

Then 70/sin(38) = f/sin(52), so f = 70*sin(52)/sin(38) ≈ 89.6.

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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.