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h²= a² + a²
h²= (√2)² + (√2)²
h²= 2+2
h=√4
h=2
h1²=b²+b²
h1²= 2² +2²
h1²= 4+4
h1=√8
h1=√4×2
h1= 2√2
|AB|= h + h1
|AB|= 2 + 2√2