Ch. 2 - Graphs of the Trigonometric Functions; Inverse Trigonometric Functions

Blitzer3rd EditionTrigonometryISBN: 9780137316601Non è quello che usi tu?Cambia libro di testo

Blitzer 3rd Edition

Ch. 2 - Graphs of the Trigonometric Functions; Inverse Trigonometric Functions

Problema 1

Capitolo 2, Problema 1

Solve the right triangle shown in the figure. Round lengths to two decimal places and express angles to the nearest tenth of a degree. A = 23.5°, b = 10

Guida verificata passo dopo passo

Identify the given information: angle \(A = 23.5^\circ\) and side \(b = 10\). From the figure, angle \(A\) corresponds to angle \(Q\), and side \(b\) corresponds to side \(p\) (opposite angle \(Q\)).

Since the triangle is right-angled at \(R\), angle \(P\) can be found using the fact that the sum of angles in a triangle is \(180^\circ\). So, calculate angle \(P\) as \(90^\circ - 23.5^\circ\).

Use the sine function to find the hypotenuse \(r\) because \(\sin(\text{angle}) = \frac{\text{opposite}}{\text{hypotenuse}}\). Here, \(\sin(23.5^\circ) = \frac{p}{r}\), so rearrange to find \(r = \frac{p}{\sin(23.5^\circ)}\).

Use the cosine function to find side \(q\) (adjacent to angle \(Q\)) because \(\cos(\text{angle}) = \frac{\text{adjacent}}{\text{hypotenuse}}\). So, \(\cos(23.5^\circ) = \frac{q}{r}\), and rearranged \(q = r \times \cos(23.5^\circ)\).

Calculate all values using the above formulas, rounding lengths to two decimal places and angles to the nearest tenth of a degree as required.

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Right Triangle Properties

A right triangle has one angle of 90 degrees, and the sides are related by the Pythagorean theorem. The side opposite the right angle is the hypotenuse, the longest side, while the other two are legs. Understanding these properties helps in identifying which sides and angles to use in calculations.

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Percorso guidato

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30-60-90 Triangles

Trigonometric Ratios (Sine, Cosine, Tangent)

Trigonometric ratios relate the angles of a right triangle to the ratios of its sides. Sine is opposite/hypotenuse, cosine is adjacent/hypotenuse, and tangent is opposite/adjacent. These ratios allow calculation of unknown sides or angles when some measurements are known.

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Sine, Cosine, & Tangent of 30°, 45°, & 60°

Angle and Side Relationship in Right Triangles

Knowing one acute angle and one side length in a right triangle allows determination of all other sides and angles. The sum of angles in a triangle is 180°, so the other acute angle can be found by subtracting the known angle and 90°. Then, trigonometric ratios can be applied to find missing sides.

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Solving Right Triangles with the Pythagorean Theorem

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