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Ch. 2 - Graphs of the Trigonometric Functions; Inverse Trigonometric Functions
Blitzer - Trigonometry 3rd Edition
Blitzer3rd EditionTrigonometryISBN: 9780137316601Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoBlitzer 3rd EditionCh. 2 - Graphs of the Trigonometric Functions; Inverse Trigonometric FunctionsProblema 3
Capitolo 2, Problema 3

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 = 52.6°, c = 54

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1
Identify the given elements in the right triangle: angle \(A = 52.6^\circ\) at vertex \(Q\), and hypotenuse \(c = 54\) (which corresponds to side \(r\) in the diagram).
Since the triangle is right-angled at \(R\), use the fact that the sum of angles in a triangle is \(180^\circ\). Calculate the other non-right angle \(B\) using \(B = 90^\circ - A\).
Use the sine and cosine definitions to find the legs \(p\) and \(q\): \(p = c \times \sin(A)\) and \(q = c \times \cos(A)\), where \(p\) is opposite angle \(A\) and \(q\) is adjacent to angle \(A\).
Substitute the known values into the formulas: \(p = 54 \times \sin(52.6^\circ)\) and \(q = 54 \times \cos(52.6^\circ)\).
Calculate the values of \(p\) and \(q\) using a calculator, then round the lengths to two decimal places and the 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 side opposite this angle is the hypotenuse, the longest side. The other two sides are called legs. Understanding the relationship between these sides and angles is essential for solving the triangle.
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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 help find unknown sides or angles when some measurements are known.
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Given an angle and a side, you can use trigonometric functions to calculate the other sides and angles. For example, using sine or cosine with the known angle and hypotenuse allows finding the legs, and the remaining angle is found by subtracting from 90°.
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