A ladder that is 25 feet long is leaning against a pillar. The vertical height from the base of the pillar to the top of the ladder is 24 feet. Which expressions represent the angle, θ, that the bottom of the ladder makes with the ground?
An angle, the bottom of the ladder makes with the ground is 73.74°.
Trigonometry is mainly concerned with specific functions of angles and their application to calculations. Trigonometry deals with the study of the relationship between the sides of a triangle (right-angled triangle) and its angles.
For the given situation,
The length of the ladder = 25 feet long
The vertical height from the base of the pillar to the top of the ladder = 24 feet
Let θ be the angle, that the bottom of the ladder makes with the ground.
The angle can be found by using the trigonometric ratio,
\(sin \theta = \frac{opposite }{hypotenuse}\)
Here, opposite side = 24 feet and hypotenuse side = 25 feet
⇒ \(sin \theta = \frac{24}{25}\)
⇒ \(sin \theta = 0.96\)
⇒ \(\theta = sin^{-1}(0.96)\)
⇒ \(\theta = 73.7397\) ≈ \(73.74\)
Hence we can conclude that an angle, the bottom of the ladder makes with the ground is 73.74°.
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