The semi-perimeter (s) of a triangle having sides a, b and c is given by the formula:

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A a + b + c
B (a + b + c)/2
C (a + b + c)/3
D 2(a + b + c)

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Answer: B. (a + b + c)/2

The perimeter of a triangle is a + b + c. The semi-perimeter s is half of the perimeter: s = (a + b + c)/2.

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The semi-perimeter (s) of a triangle having sides a, b and c is given by the formula:

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