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a = 4, b = 12 and c = 13

Applying the Pythagorean Theorem, c² = a² + b²

Substituting the values of a, b and c in the above formula.

We get,

13² = 4² + 12²

169 = 16 + 144

169 = 160 ( This is false)

Therefore the given sides 4, 12 and 13 does not form a Right triangle.

Applying the Pythagorean Theorem, c² = a² + b²

Substituting the values of a, b and c in the above formula.

We get,

b = 60.3986…

Round off to the nearest tenths place = b = 60.4