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15-03-2019
Mathematics

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2071nabil 2071nabil

15-03-2019

Answer:

11.3 units

Step-by-step explanation:

backward Pythagoras theorem

c²- b²=a²

12²-4²=a²

144 - 16 = a²

128=a²

√(128)=a\

11.3=a

11.3 units

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