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+2a)
+
+//print "enter the radius of the circle:"
+
+//scan the number inputted and store it as <circle_radius>
+
+//run the equation to find the circumference = <2 * 3.1416 * circle_radius>
+
+//print the circumference that was equated, that is the answer
+
+ 
+
+2b)
+
+#include<stdio.h>
+int main()
+{
+    int circle_radius;
+
+    float PI_VALUE = 3.1416, circle_area, circle_circumference;
+    //ask for the radius
+    printf("\nInput the radius of the circle:");
+    //store the input
+    scanf_s("%d", &circle_radius);
+
+
+    //calculate circumference
+    circle_circumference = 2 * PI_VALUE * circle_radius;
+
+
+    //display the circumference
+    printf("\nCircumference is equal to: %f", circle_circumference);
+
+    return (0);
+
+}
+
+ 
+
+2c)
+
+#include<stdio.h>
+int main()
+{
+    int circle_radius;
+
+    float PI_VALUE = 3.1416, circle_area, circle_circumference;
+    //ask for the radius
+    printf("\nInput the radius of the circle:");
+    //store the input
+    scanf_s("%d", &circle_radius);
+
+
+    //calculate circumference
+    circle_circumference = 2 * PI_VALUE * circle_radius;
+
+
+    //display the circumference
+    printf("\nCircumference is equal to: %f", circle_circumference);
+
+    return (0);
+
+}