Okay you math guys out there, I've got a (seemingly) simple problem that I can't remember how to solve. It's the second day of school, leave me alone :P

What is the length of the blue line labeled r in the image below? Give your answer in terms of a and b.

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wha?
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We are going to need actual numbers if you want an answer in a number. Also Pythagorean theorem.
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The square root of (a^2 + b^2)

Quote by jeff541
We are going to need actual numbers if you want an answer in a number. Also Pythagorean theorem.

He wants his answer in terms of a and b.
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It's just a guess but r= the square root of a^2+b^2
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If a and b are the dotted lines, then a squared plus b squared equals c (in this case, r) squared. Pythagorean theorem.

Otherwise I'm not sure what you're asking.
r = long
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well you know the b side is of a lentgth of B and that the side know as ( B, corner of blue line) is of a length of a then only use Pytaghor ( sorry for the errors)
Quote by jeff541
We are going to need actual numbers if you want an answer in a number. Also Pythagorean theorem.

He said in terms of A and B

R(squared) = A(squared) + B(squared)

You can simplify it from there to get R, I'm too lazy.
lemon is right.
square root of 2(b+a)^2
haha I thought it read "meth help". you should change it and build a meth lab.
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TS how old are you because this is really straight forward stuff that I could do when I was about 12 or 13?
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Quote by Craig_241
TS how old are you because this is really straight forward stuff that I could do when I was about 12 or 13?

Says he's 15 in his profile.

Damn I wish I was getting taught stuff that easy when I was 15
r^2 = a^2 + b^2, or r = the square root of (a^2 + b^2)
Pythag; The square of the hypotenuse is equal to the sum of the squares of the other two sides; therefore r.squared = a.squared plus b.squared, so = the square root of (a.squared + b.squared).
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Quote by UncleCthulhu
Says he's 15 in his profile.

Damn I wish I was getting taught stuff that easy when I was 15

16 now :P

Like i said, it's the second day of school. My brain isnt exactly...ahem....working quite yet. If it was last year, I would've been on this no problem. Thanks though guys.
Ruler, do you have one?
Square root of a-square + b-square

TS, you're huge aren't you? Trade you some brain cells for your pecs
It's where a and b meet! I got it right!
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Something you definitely need to know