Unit Circle Trig

Front

What is the definition of the unit circle?

Back

The unit circle is a circle with a radius of 1 centered at the origin (0,0) in the coordinate plane, used to define trigonometric functions.

Front

What is the formula to find the length of an arc in a circle?

Back

Length of arc = r * θ, where r is the radius and θ is the angle in radians.

Front

What is the value of sin(0°)?

Back

0

Front

What is the value of cos(0°)?

Back

1

Front

What is the value of tan(0°)?

Back

0

Front

In which quadrants is cosθ positive?

Back

The 1st and 4th quadrants.

Front

In which quadrants is sinθ positive?

Back

The 1st and 2nd quadrants.

Front

What is the value of sin(90°)?

Back

1

Front

What is the value of cos(90°)?

Back

0

Front

What is the value of tan(90°)?

Back

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