Unit Circle Basics

All six trigonometric functions are positive in the first quadrant.

• True
• False

The radius of the unit circle equals 10.

• True
• False

The sine function represents the x-coordinate.

• True
• False

The cosine represents the x-coordinate.

• True
• False

The tanθ can be written as sinθ/cosθ.

• True
• False

cos(30^o)

• 1/2
• -1/2
• √3/2
• -√3/2

sin(240^o)

• √3/2
• -√3/2
• 1/2
• -1/2

tan(45^o)

• √2/2
• 1/2
• √3/2
• 1

sin(135^o)

• -√2/2
• √2/2
• √3/2
• 1/2

Tags

CCSS.HSF.TF.A.3

CCSS.HSF.TF.A.4

tan(270^o)

• 1
• -1
• 0
• undefined

Tags

CCSS.HSF.TF.A.2

CCSS.HSF.TF.A.3

CCSS.HSF.TF.A.4