Terms and Quick Facts Unit 9 and 10

What is a radian?

• A unit of angle equal to an angle at the center of a circle whose arc is equal in length to the radius

• A unit of angle equal to 90 degrees

• A unit of angle equal to 180 degrees

• A unit of angle equal to 360 degrees

In standard position, where is the initial side of the angle located?

• On the positive x-axis

• On the positive y-axis

• On the negative x-axis

• On the negative y-axis

In which direction do we rotate for positive standard position angles?

• Counterclockwise

• Clockwise

• Upwards

• Downwards

Arjun and Nora are discussing the direction to rotate for negative standard position angles. In which direction should they rotate?

• Clockwise

• Counterclockwise

• Upwards

• Downwards

When are two angles considered coterminal?

• If they have the same initial and terminal sides

• If they have the same measure

• If they are both acute angles

• If they are both obtuse angles

What is a reference angle?

• The smallest acute angle that the terminal arm of the angle makes with the x-axis when drawn on a coordinate

• An angle equal to 90 degrees

• An angle equal to 180 degrees

• An angle equal to 360 degrees

What is the amplitude of a sinusoidal graph?

• The distance from the midline to the highest or lowest point on the graph

• The horizontal distance it takes for the graph to complete one full cycle

• How far horizontally the graph has been moved from the usual position

• The horizontal line that the graph oscillates around

Priya and Emma are studying sinusoidal graphs. What is the midline of a sinusoidal graph?

• The distance from the midline to the highest or lowest point on the graph

• The horizontal distance it takes for the graph to complete one full cycle

• How far horizontally the graph has been moved from the usual position

• The horizontal line that the graph oscillates around

What does the phase shift of a graph describe?

• The distance from the midline to the highest or lowest point on the graph

• The horizontal distance it takes for the graph to complete one full cycle

• How far horizontally the graph has been moved from the usual position

• The horizontal line that the graph oscillates around

What is the period of a sinusoidal graph?

• The distance from the midline to the highest or lowest point on the graph

• The horizontal distance it takes for the graph to complete one full cycle

• How far horizontally the graph has been moved from the usual position

• The horizontal line that the graph oscillates around