Answer:
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Proabably. 5 because if there is 2 sides on a coin then you should divide 10÷2 which is 5.
The answer is C.
You need you use Pythagoras theorem 2 times to have 2 equations with the same sides i.e. for example a2 + b2 = 81 and a2 - b2 = 9.
You can do it as you have different triangles but with the same sides.
