What part of a file name does windows use to know which application to open to manage the file?

None. the wood chuck riddle says if he could chuck wood so the answers none

Cprogram to find //perimeter of rectangle printf(" \n perimeter of rectangle \n"); printf(""); printf("\n enter width and length of the rectangle : "); scanf("%f%f", & width,& length); perimeter = 2 * (width + length); printf("perimeter of rectangle is: %.3f", perimeter);  

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Step 1 is the correct step