If the sides of a triangle are: a = 2, b = 3 and c = 5, what is angle A.

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justaguide | College Teacher | (Level 2) Distinguished Educator

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Before an attempt is made to determine the value of A, look at the length of the sides given. The sum of a and b is equal to that of c. In a triangle, the sum of the length of any two sides should be greater than that of the third side.

As this is not the case here, the given lengths do not define a triangle.