Problem 91 - Algebra and Trigonometry Real Mathematics, Real People

Question

Find (if possible) the complement and supplement of the angle. $$\frac{3 \pi}{2}$$

Step-by-Step Solution

Answer

The complement and supplement of the angle \(\frac{3\pi}{2}\) do not exist.

Step 1: Determine the complementary angle

Subtract given angle \(\frac{3 \pi}{2}\) from \(\frac{\pi}{2}\). However, since the given angle is strictly larger than \(\frac{\pi}{2}\), it can be concluded that the complement of \(\frac{3\pi}{2}\) does not exist.

Step 2: Determine the supplementary angle

Subtract given angle \(\frac{3 \pi}{2}\) from \(\pi\). Since the given angle is strictly larger than \(\pi\), the supplement of \(\frac{3\pi}{2}\) does not exist.

Key Concepts

Trigonometry

Trigonometry is a branch of mathematics that delves into the relationships between the angles and sides of triangles, particularly right triangles. The fundamental functions in trigonometry are sine, cosine, and tangent, often abbreviated as sin, cos, and tan, respectively.

These functions are defined using the ratios of different sides of a right triangle: sin is the ratio of the opposite side to the hypotenuse, cos is the ratio of the adjacent side to the hypotenuse, and tan is the ratio of the opposite side to the adjacent side. Apart from right triangles, trigonometry also deals with the properties and applications of angles in more general settings, such as in circles.

In the context of the exercise dealing with \( \frac{3 \pi}{2} \), which is an angle in radian measure, we encounter a scenario where trigonometric functions and the concept of complementary and supplementary angles come into play. However, since this specific angle is larger than \( \pi \), conventional complementary and supplementary angles don't apply, as they are defined within the first quadrant (< \( \frac{\pi}{2} \) for complement and < \( \pi \) for supplement).

Radian Measure

Radian measure is a way of expressing the size of an angle by comparing the arc length subtended by the angle to the radius of the circle. One radian is the angle at which the arc length equals the radius.

The radian measure of a full circle is \( 2\pi \), which implies that \( \pi \), or 180 degrees, represents a half-circle, and \( \frac{\pi}{2} \), or 90 degrees, represents a quarter-circle or right angle. Therefore, when we encounter an angle such as \( \frac{3\pi}{2} \), we're dealing with an angle that corresponds to three-quarters of a full rotation around a circle, equivalent to 270 degrees.

This angle exceeds the limits for defining complementary (\< \( \frac{\pi}{2} \) radian, or < 90 degrees) and supplementary angles (\< \( \pi \) radian, or < 180 degrees), which is why the complementary and supplementary angles for \( \frac{3\pi}{2} \) do not exist.

Angle Properties

Angle properties are fundamental components of geometry that involve the study and characterization of angles. Complementary angles are two angles that add up to \( \frac{\pi}{2} \) radians (or 90 degrees), whereas supplementary angles add up to \( \pi \) radians (or 180 degrees).

The exercise in question involves ascertaining such relationships for an angle measuring \( \frac{3\pi}{2} \). Within the realm of angle properties, it's understood that angles larger than \( \pi \) radians cannot have a supplementary angle, since that would require an impossible total angle measure greater than \( 2\pi \) radians, which is the total measure of a circle. Similarly, angles larger than \( \frac{\pi}{2} \) radians cannot have a complement.

This analysis is crucial for ensuring correct problem-solving in trigonometry and clear understanding of angle measurements, as failure to recognize these properties can result in attempting to calculate non-existent complementary or supplementary angles for certain measures, like the one provided in the exercise.