Made a simple geometric workbench

misc/geometric_workbench/circle.c

@@ -0,0 +1,15 @@
+#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;
+    scanf("%f", &radius);
+    printf("%.3f\n", M_PI*(pow(radius, 2))); 
+    return 0;
+}