Radian Unit Circle

What is the radius of the unit circle?

• 1

• 2

• 10

• It varies.

The sine of any angle on the unit circle is the y-coordinate.

• True

• False

When drawing a right triangle from any point on the unit circle to the x-axis, the hypotenuse is equal to one.

• True

• False

sin π/4

• √2∕2

• 1/2

• √3/2

• 0

Convert 100⁰ to radians

• 5π/9

• π/2

• 5π/8

• 5π/6

What is 60 degrees in radians? 

• 2π/3

• π/3

• 4π/3

• π/6

How many radians does a circle have?

•   360 degrees

• 2pi radians

• pi radians

• ^{2 radians}

Convert 150⁰ to radians

• 5π/6

• 3π/4

• 7π/6

• 2π/3

Radians: What is 240° in radians?

The diameter of a circle is 8 centimeters. A central angle of the circle intercepts an arc of 12 centimeters. What is the radian measure of the angle?

Mathematical Equivalence

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