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Mathematics 8 Online
OpenStudy (anonymous):

tan 120 degrees

OpenStudy (anonymous):

use a reference angle to find the exact value for tan 120 degrees

OpenStudy (mertsj):

What is the reference angle for 120 degrees?

OpenStudy (anonymous):

60?

OpenStudy (mertsj):

What is the tangent of 60 degrees?

OpenStudy (anonymous):

i don't understand how to figure that out

OpenStudy (mertsj):

Draw a 30-60-90 triangle. Label the sides and angles. Use the fact that tangent is side opp over side adj

OpenStudy (anonymous):

what are the sides labeled

OpenStudy (mertsj):

|dw:1369615706859:dw|

OpenStudy (anonymous):

so tan is 1/sqaure root 3

OpenStudy (mertsj):

Yes. That is the tangent of 30 but you are trying to find the tangent of 60

OpenStudy (anonymous):

so the tan of 60 is sqaure root of 3

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