Special Right Triangles and the Unit Circle

What is the value of y?

• 3√2

• 4√3

• 6

• 1

What is the value of x?

• 2

• 18

• 2√9

• 9√2

I have been given the long leg in this 30-60-90 triangle.  How do I find the short leg?

• Multiply 7 by 2

• Multiply 7 by √3

• Divide 7 by 2

• Divide 7 by √3

Find the value of y.

• 7

• 7√3

• 14√3

• (14√3)/3

What is the radius of the unit circle?

What type of circle plays a large role in understanding trig functions?

• An elliptic circle

• The unit circle

• The perfect circle

• The Pythagorean circle

What is the radius of the unit circle?

• 0

• 1

• 1/2

• √2/2

Based on your unit circle cos(30^o)=

• 1

• 1/2

• sqt3/2

• sqt2/2

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

• Opp

• OP

• Adj

• x

• Hyp

• y

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