Determine two coterminal angles positive and negative

The video tutorial explains coterminal angles, which have the same initial and terminal sides. It covers how to calculate these angles, including the use of negative directions and the addition or subtraction of 2π to find coterminal angles. The tutorial provides examples of both negative and positive coterminal angles, ensuring a comprehensive understanding of the concept.

What is a coterminal angle?

• An angle that has a different initial side but the same terminal side.

• An angle that has the same initial and terminal sides.

• An angle that is always positive.

• An angle that is always negative.

How can you find a coterminal angle?

• By multiplying the angle by 2π.

• By dividing the angle by 2π.

• By adding or subtracting π from the angle.

• By adding or subtracting 2π from the angle.

If an angle is -9π/4, what is one of its coterminal angles?

• π/4

• 3π/4

• -π/4

• 5π/4

What is the positive coterminal angle of -π/4?

• 7π/4

• 5π/4

• 3π/4

• π/4

Which of the following is a coterminal angle of 7π/4?

• π/4

• 3π/4

• 5π/4

• 15π/4