Answer:
the second answer : 4.5
Explanation:
remember Pythagoras :
c² = a² + b²
c being the Hypotenuse (the baseline opposite of the 90° angle).
so, we have
6² = 4² + b²
36 = 16 + b²
b² = 20
b = sqrt(20) = 4.472135955... ≈ 4.5 mm
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