Math Problem Statement

Find the reference angle for (29pi/3)

Solution

To find the reference angle for the angle 29π3\frac{29\pi}{3}, we first need to bring the angle within the standard range of 00 to 2π2\pi.

Step 1: Reduce the angle to within one full rotation

Since 2π2\pi represents a full rotation, we want to subtract multiples of 2π2\pi from 29π3\frac{29\pi}{3} until it falls within the range 0θ<2π0 \leq \theta < 2\pi.

Start by dividing 29π3\frac{29\pi}{3} by 2π2\pi to see how many full rotations fit: 29π3÷2π=296\frac{29\pi}{3} \div 2\pi = \frac{29}{6} This gives approximately 4.8334.833. This means that 29π3\frac{29\pi}{3} has completed 4 full rotations, and we have a remainder of 0.8330.833 of a full rotation.

Step 2: Subtract full rotations

Now, subtract the integer part of the division (which is 4 full rotations, or 4×2π=8π4 \times 2\pi = 8\pi) from 29π3\frac{29\pi}{3}: 29π38π=29π324π3=5π3\frac{29\pi}{3} - 8\pi = \frac{29\pi}{3} - \frac{24\pi}{3} = \frac{5\pi}{3} So, the reduced angle is 5π3\frac{5\pi}{3}, which is between 00 and 2π2\pi.

Step 3: Find the reference angle

The reference angle is the smallest positive angle between the terminal side of the given angle and the x-axis. To find it for an angle in the fourth quadrant (like 5π3\frac{5\pi}{3}), we subtract it from 2π2\pi:

2π5π3=6π35π3=π32\pi - \frac{5\pi}{3} = \frac{6\pi}{3} - \frac{5\pi}{3} = \frac{\pi}{3}

Thus, the reference angle for 29π3\frac{29\pi}{3} is π3\frac{\pi}{3}.


Would you like further details or have any questions?

Here are some related questions for you to explore:

  1. How do you find the reference angle for an angle in the second quadrant?
  2. How can you convert an angle in radians to degrees?
  3. What is the relationship between an angle and its coterminal angles?
  4. How do you find the reference angle for 7π4\frac{7\pi}{4}?
  5. How do periodic functions (like sine and cosine) behave for angles greater than 2π2\pi?

Tip: When working with angles larger than 2π2\pi, always reduce the angle to a value between 00 and 2π2\pi first to make finding the reference angle easier.

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Math Problem Analysis

Mathematical Concepts

Trigonometry
Reference Angles
Radians
Angle Reduction

Formulas

Reference angle = 2π - θ (for angles in the fourth quadrant)
Reducing angles to the range 0 ≤ θ < 2π

Theorems

Reference angle theorem
Coterminal angle theorem

Suitable Grade Level

Grades 9-11