SOLUTION: What is the length of the blue line labeled r in the image below? Give your answer in terms of a and b. blue line labeled r starting at the orgin and ending at a point a,b T

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Question 433343: What is the length of the blue line labeled r in the image below? Give your answer in terms of a and b.
blue line labeled r starting at the orgin and ending at a point a,b
Then I come up with the answer r = sqrt(a^2 + b^2), but it always says Check the syntax of your response. I have changed many times, but hopeless.
Please help!!!!
Answer by richard1234(5390) About Me  (Show Source):
You can put this solution on YOUR website!
By the Pythagorean theorem, r+=+sqrt%28a%5E2+%2B+b%5E2%29. If you are trying to enter it on an online class/test, you might want to try

sqrt(a^2 + b^2)
Sqrt[a^2 + b^2] if you are using Wolfram Mathematica (or similar) software
$\sqrt{a^2 + b^2}$ if you are using LaTeX

If it doesn't accept any of these formats, you might want to look into your online software's manual on how to input such expressions.