SOLUTION: two sides of a 30 degrees -60 degrees -90 degrees triangle are 9 and 18. what is the length of the third side?

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Question 550887: two sides of a 30 degrees -60 degrees -90 degrees triangle are 9 and 18. what is the length of the third side?
Answer by Alan3354(69443) About Me  (Show Source):
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two sides of a 30 degrees -60 degrees -90 degrees triangle are 9 and 18. what is the length of the third side?
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The 18 side is the hypotenuse.
a%5E2+%2B+b%5E2+=+c%5E2
9%5E2+%2B+b%5E2+=+18%5E2
b%5E2+=+243
b+=+sqrt%28243%29+=+9sqrt%283%29
b =~ 15.588