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Mathematics 7 Online
OpenStudy (anonymous):

Need someone to double check this one. In △JKL, what is the length of KL?

OpenStudy (anonymous):

OpenStudy (anonymous):

Answer choices: 11.5 \[23\sqrt{2}\] 46 (this is my choice) \[23\sqrt{3}\]

OpenStudy (anonymous):

kl=23/tan30

OpenStudy (noelgreco):

In a 30-60-90 triangle the longer leg is equal to the shorter leg times sqrt 3

OpenStudy (anonymous):

ok

OpenStudy (anonymous):

So you are saying the last answer is correct

OpenStudy (noelgreco):

Yes.

OpenStudy (anonymous):

Ok thank you. :)

OpenStudy (noelgreco):

It is a good thing to memorize the relationships in a 30-60-90 rt triangle. The hypotenuse is twice the length of the shorter leg, and the longer leg is sqrt 3 times the shorter. That allows you to derive the six trig functions for 10 and 60 degrees.

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