Made a simple program to calculate the area

area.c

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+#include <stdio.h>
+#include <math.h>
+
+/* Simple program to calculate the area of a circles, triangles and rectangles.
+ * 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).
+ */
+
+float circle(float r)
+{
+    return M_PI*(pow(r, 2)); // pow and M_PI is from math.h
+}
+
+float triangle(float b, float h) 
+{
+    return b*h/2; // the return value is a float, since the function is a float
+}
+
+float rectangle(float b, float h)
+{
+    return b*h; // the return value is a float, since the function is a float
+}
+
+
+int main()
+{
+    int choice;
+    float area, radius, base, hight;
+
+    printf("1. Circle\n2. Triangle\n3. Rectangle\n> ");
+    scanf("%d", &choice); //%d for integers
+
+    if (choice == 1)
+    {
+        printf("\nEnter radius of the circle: "); scanf("%f", &radius);
+        area = circle(radius);
+        printf("\nArea of the circle is %.2f\n", area); //%.2f for 2 decimals
+    }
+    else if (choice == 2)
+    {
+        printf("\nEnter the triangles base: "); scanf("%f", &base);
+        printf("\nEnter the tirangles hight: "); scanf("%f", &hight);
+        area = triangle(base, hight);
+        printf("\nThe triangles area is %.2f\n", area); 
+    }
+    else if (choice == 3)
+    {
+        printf("\nEnter the rectangles base: "); scanf("%f", &base);
+        printf("\nEnter the rectangles hight: "); scanf("%f", &hight);
+        area = rectangle(base, hight);
+        printf("\nThe rectangles area is %.2f\n", area); 
+    }
+    else
+    {
+        printf("\nInvalid choice, quitting...\n");
+        return 1; // Return value greater than 0 for errors
+    }
+
+    return 0; // Return 0 if everything went ok
+}