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DiKsa [7]
2 years ago
14

Please help and show working out

Mathematics
1 answer:
slavikrds [6]2 years ago
7 0

cb^2 + ab^2 = ca^2  pythagorean theorem

cb^2 +6^2 = 12^2

cb^2 +36 = 144

cb^2 = 108

cb = sqrt (108)

sin D = opp /hyp

sin D =bc/cd

sin 55 = sqrt(108)/cd

cd = sqrt(108)/sin 55

cd=12.687

cd = 12.7  to three significant figures

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<h2>Answer:</h2>

<u>The equivalent expression is </u><u> (2 / x ^ 3) * sqrt (2)</u>

<h2>Step-by-step explanation:</h2>

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djverab [1.8K]

Complete question is;

A 21 ft ladder is leaning against a tall wall with the foot of the ladder placed at 7 feet from the base of the wall and the angle of elevation is?

Answer:

θ = 70.5°

Step-by-step explanation:

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I've attached a diagram showing the triangle made by this ladder and the wall.

From the attached diagram, we can see the triangle formed by the ladder and the wall.

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Thus;

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