Exploring Sine, Cosine, Tangent, and the Unit Circle

What does the radius of the unit circle equal to?

• -1

• 1

• 0

• 2

In the acronym SOHCAHTOA, what does 'SOH' stand for?

• Sine = Opposite over Adjacent

• Sine = Opposite over Hypotenuse

• Sine = Hypotenuse over Opposite

• Sine = Adjacent over Hypotenuse

What is the sine of an angle in the first quadrant?

• Always negative

• Undefined

• Always zero

• Always positive

For an angle in the second quadrant, which trigonometric function is positive?

• All of them

• Cosine

• Tangent

• Sine

For an angle of 120 degrees, which side of the triangle is negative?

• Opposite

• Adjacent

• None of them

• Hypotenuse

What is the value of cosine at 270 degrees?

• 1

• 0

• -1

• Undefined

Which trigonometric function is undefined for an angle on the positive y-axis?

• Sine

• Cosine

• Tangent

• All of them

What is the reference angle for an angle of 330 degrees?

• 90 degrees

• 30 degrees

• 45 degrees

• 60 degrees

What does the mnemonic 'ASTC' stand for?

• Angle Sine Tangent Cosine

• All Sides Take Corners

• All Students Take Calculus

• Adjacent Sine Tangent Cosine

What is the cosine of 360 degrees?

• -1

• 1

• 0

• Undefined