Q. Find the reference angle for a rotation of 1310π.Answer:
Concept of Reference Angle: Understand the concept of a reference angle. A reference angle is the acute angle formed by the terminal side of an angle in standard position and the x-axis. It is always between 0 and 2π radians (or 0 and 90 degrees) and is positive.
Location in Unit Circle: Determine the location of the angle in the unit circle.Since (10π)/(13) is less than 2π but greater than π, the angle is located in the third quadrant of the unit circle.
Calculate Reference Angle: Calculate the reference angle.To find the reference angle for an angle in the third quadrant, subtract π from the angle.Reference angle = 1310π−π
Perform Subtraction: Perform the subtraction to find the reference angle.Reference angle = (1310π)−(1313π)Reference angle = (1310π−13π)Reference angle = −133πSince the reference angle must be positive, we take the absolute value.Reference angle = ∣−133π∣=133π
Verify Correct Range: Verify that the reference angle is in the correct range. The reference angle of 133π is between 0 and 2π, which is the correct range for a reference angle.