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x²+144=a²
a²+b²=324
x²+144+x²+36=324
2x²=324-180
2x²=144
x²=144/2
x²=72
x=√72
x=6√2
..................
x²+36=b² x²=72
72+36=b²
b=√108
b=6√3
.................
x²+144=a²
72+144=a²
a=√216
a=6√6
..................
x²+12²=a²
b²+a²=18²
b²-6²+12²=a²
b²=a²+6²-12²
a²+36-144+a²=18²
2a²-108=324
2a²=324+108
2a²=432
a²=216
a=6√6
b²=(6√6)²+6²-12²
b²=216+36-144
b²=108
b=6√3
x²=(6√3)²-6²
x²=108-36
x²=72
x=6√2
x=6√2
a=6√6
b=6√3