Pythagorean Theron can someone help me with this

2a^2=6^2
a^2=18
a= +/- 3 root 2

It would be plus 3 root 2, since you can’t have a negative length. Also, the two dash lines means the lengths are equal, which is why I wrote it as 2a^2 instead of a^2+b^2=c^2(where a and b are equal).

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