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b = 1/2. 8 = 4
s² = a²+b²
s² = 3²+4²
s² = 9+16
s = √25
s = 5cm
= ( 6 : 2 )² + ( 8 : 2 )²
= √ 3² + 4²
= √9 + 16
= 25
= √25
= 5