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Convert the following angles from radians to degrees: (a) \(\pi / 6 \mathrm{rad}\) (b) \(5 \pi / 12 \mathrm{rad}\) (c) \(3 \pi / 4 \mathrm{rad},\) and (d) \(\pi\) rad.

Short Answer

Expert verified
(a) 30°, (b) 75°, (c) 135°, (d) 180°

Step by step solution

01

Understanding the Conversion Factor

To convert from radians to degrees, we use the fact that \(180^\circ\) is equivalent to \(\pi\) radians. Therefore, the conversion factor from radians to degrees is \(\frac{180}{\pi}\). This means that to convert any angle in radians to degrees, you multiply the angle by \(\frac{180}{\pi}\).
02

Converting \(\pi / 6\) radians to Degrees

Multiply \(\pi / 6\) by \(\frac{180}{\pi}\):\[\left( \frac{\pi}{6} \right) \times \frac{180}{\pi} = \frac{180}{6} = 30^\circ.\]
03

Converting \(5 \pi / 12\) radians to Degrees

Multiply \(5 \pi / 12\) by \(\frac{180}{\pi}\):\[\left( \frac{5\pi}{12} \right) \times \frac{180}{\pi} = \frac{5 \times 180}{12} = 75^\circ.\]
04

Converting \(3 \pi / 4\) radians to Degrees

Multiply \(3 \pi / 4\) by \(\frac{180}{\pi}\):\[\left( \frac{3\pi}{4} \right) \times \frac{180}{\pi} = \frac{3 \times 180}{4} = 135^\circ.\]
05

Converting \(\pi\) radians to Degrees

Multiply \(\pi\) by \(\frac{180}{\pi}\):\[\pi \times \frac{180}{\pi} = 180^\circ.\]

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

radians to degrees
Converting angles from radians to degrees is a fundamental concept in mathematics, particularly in trigonometry. This conversion is crucial because different problems or applications may require measurements in one unit or the other. The relationship between radians and degrees is based on the fact that a complete circle is equal to \(360^\circ\) or \(2 \pi\) radians. Hence, \(180^\circ\) is equivalent to \(\pi\) radians.

When you need to convert radians to degrees, you simply multiply the given angle in radians by the conversion factor \(\frac{180}{\pi}\). This factor comes from the equivalence of \(\pi\) radians to \(180^\circ\).
  • Use \(\pi/6 = 30^\circ\) as a guiding example where steps are simple: multiply by \(\frac{180}{\pi}\) to cancel out \(\pi\) and solve.
  • Apply this to any angle given in radians for a straightforward conversion to degrees.
    The simplicity of this method allows quick adjustment between these measurement units, vital for solving trigonometric problems efficiently.
mathematical conversion
Mathematical conversion between units is a routine operation in math, allowing you to translate quantities from one system to another. This practice, especially for angle measurement, ensures that we can use the units that fit our context best.

When performing a conversion from radians to degrees, remember:
  • Identify the conversion factor, which is \(\frac{180}{\pi}\) for radian to degree conversion.
  • Apply this factor directly in calculations by multiplying it with the radian measurement.
This approach is not limited to angles; similar strategies can be applied in various mathematical scenarios like converting length units, temperature scales, and more. It simplifies problem-solving by allowing compatibility between different systems.

Using these systematic methods ensures consistency and accuracy across calculations and allows smoother transitions between different fields of math.
trigonometry
Trigonometry, as a branch of mathematics, heavily depends on angles and their measurements. Angles are the foundation of trigonometric functions which are used to model cyclic behaviors like waves, oscillations, and circular motion. Understanding angle conversion, particularly from radians to degrees, is pivotal in this field. Radians are often preferred in higher-level mathematical computations because they simplify many equations and allow for more natural descriptions of oscillatory motion. However, degrees make it easier to visualize angles in a real-world context. Knowing both units enables you to switch between general mathematics and applied situations seamlessly.

In trigonometry, when dealing with sine, cosine, and tangent, angles need to be accurately translated to ensure that calculations conform to expected results. This might include using degrees for practical engineering solutions or radians for theoretical physics problems. Employing both units effectively expands your capability to approach a wide range of problems.

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Most popular questions from this chapter

The blades of a fan running at low speed turn at 250 rpm. When the fan is switched to high speed, the rotation rate increases uniformly to \(350 \mathrm{rpm}\) in \(5.75 \mathrm{~s}\). (a) What is the magnitude of the angular acceleration of the blades? (b) How many revolutions do the blades go through while the fan is accelerating?

A wheel of radius \(1.5 \mathrm{~m}\) rotates at a uniform speed. If a point on the rim of the wheel has a centripetal acceleration of \(1.2 \mathrm{~m} / \mathrm{s}^{2},\) what is the point's tangential speed?

Imagine that you swing about your head a ball attached to the end of a string. The ball moves at a constant speed in a horizontal circle. (a) Can the string be exactly horizontal? Why or why not? (b) If the mass of the ball is \(0.250 \mathrm{~kg}\), the radius of the circle is \(1.50 \mathrm{~m}\), and it takes 1.20 s for the ball to make one revolution, what is the ball's tangential speed? (c) What centripetal force are you imparting to the ball via the string?

In a noninjury, noncontact skid on icy pavement on an empty road, a car spins 1.75 revolutions while it skids to a halt. It was initially moving at \(15.0 \mathrm{~m} / \mathrm{s}\), and because of the ice it was able to decelerate at a rate of only \(1.50 \mathrm{~m} / \mathrm{s}^{2}\). Viewed from above, the car spun clockwise. Determine its average angular velocity as it spun and slid to a halt.

The asteroid belt that lies between Mars and Jupiter may be the debris of a planet that broke apart or that was not able to form as a result of Jupiter's strong gravitation. An average asteroid has a period of about \(5.0 \mathrm{y}\). Approximately how far from the Sun would this "fifth" planet have been?

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