Threads: Write a program to 3 number a, b, c. Check if a, b, c Is 3 edge of the triangle is not? If 3 edge of the triangle, the triangle area calculation formula: where p is half the perimeter of the triangle. Input: A line of 3 numbers separated by spaces. Output:
1/ If 3 forming triangular edges, print out a line of 2 numbers separated by a space are the perimeter and area of triangles. Rounded to 2 decimal.
2/ If 3 not forming triangular edges, printed word “NO”.