sp + 11) 7. (Numerical) Heron's formula for the area, A, of a triangle with sides of length a, b, and cin A= v[sls - aXs - b(s - c)] where (a +b+c) 2 Write, test, and execute a function that accepts the values of a, b, and c as parameters from a calling function, and then calculates the values of s and [s(s - a)(s - b)(s - c)]. If this quantity is positive, the function calculates A. If the quantity is negative, a, b, and c do not form a triangle, and the function should set A = -1. The value of A should be returned by the function. %3D

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