Speed Trig Unit Circle

In which quadrant are ALL trig functions positive?

In which quadrants are SINE functions positive?

In which quadrants are TANGENT functions positive?

Place the labels where they belong on the unit circle.

a

b

c

d

e

f

g

y axis

x axis

origin

Using θ as a reference angle, mark the triangle sides as Opp, Adj, and Hyp. Label these on the triangle on your paper.

• Opp

• y

• Adj

• x

• Hyp

• OP

The Unit Circle has four quadrants such that:

• All quadrants have 90 degrees

• Quadrant IV is between π and 3π/2 radians

• Quadrant III is between 3π/2 and 2π and radians

• Quadrant I is where the acute angles are

• sinθ

• OP

• 1

• cosθ

• undefined

Answer explanation

In which quadrants are COSINE functions positive?