Sine and Cosine of Special Triangles Unit Circle

At θ = 30°, what is the equivalent angle measure in radians?

• π/2
• π/3
• π/4
• π/6

90° is equal to how many radians?

• π/4
• π/2
• π
• 2π

π/3 is equal to how many degrees?

• 30°
• 60°
• 90°
• 120°

What is the value of θ, theta, in degrees on the unit circle?

• 30°
• 45°
• 60°
• 90°

Based on the unit circle, what is the value of sin?

• y/1
• x/1
• 1/y
• y/x

Based on the unit circle, what is the value of cos?

• y/1
• x/1
• 1/y
• y/x

Based on the unit circle, what is the value of tan?

• y/1
• x/1
• 1/y
• y/x

What is the exact value of sin π/4

• √2∕2
• 1/2
• √3/2
• 0

True or False:  There are actually 6 trig ratios, because each trig ratio (sine, cosine, and tangent) has a reciprocal ratio (cosecant, secant, and cotangent).

• True
• False

What is the exact value of cos π/6

• -1/2
• 1/2
• √3/2
• -√3/2