Added program for calculation circles

circles.c

@@ -0,0 +1,17 @@
+#include <stdio.h>
+#include <math.h>
+
+/* Simple program to calculate the area and circumference of a circle.
+ * Remeber to compile with the -lm option to link the math library.
+ * The math library includes pow (to the power of) and M_PI (pi).
+ */
+
+int main()
+{
+    float radius;
+    printf("Enter radius of the circle: ");
+    scanf("%f", &radius);
+    printf("Area of the circle is: %.2f\n", M_PI*(pow(radius, 2))); 
+    printf("Circumference of the circle is: %.2f\n", 2*M_PI*radius); 
+    return 0;
+}