Radian Circle

Radian measure can be found by:

• Finding the ratio of circumference and diameter

• Finding the ratio of radius and pi

• Finding the ratio of arc length and measure of central angle

• Changing calculator setting to radians

sin π/4

• √2∕2

• 1/2

• √3/2

• 0

cos 5π/6

• -1/2

• 1/2

• √3/2

• -√3/2

cos 4π/3

• -√3/2

• √3/2

• 1/2

• -1/2

• 1
• -1
• 0
• √2/2

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

• y/r

• x/r

• r/y

• y/x

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

• y

• x

• x/y

• y/x

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

• y

• x

• x/y

• y/x

Convert 4π/ 3 radians in degrees

• 120

• 240

• 210

• 270

Alison is jogging on a circular track that has a radius of 140 feet. She runs along the track from point R to point N, a distance of 230 feet. Find the radian measure of <RUN.

• 1.64

• 90

• 0.61