rewrite description

subjects/getarea/README.md

@@ -1,13 +1,12 @@
 ## get-area
 
-### instructions
+### Instructions
+
+Write a program that takes a positive number as radius and prints the area of a circle.
+  - The area of the circle is `3.14` times the radius squared.
+  - Only positive numbers will be accepted, otherwise print `Error` followed by (`'\n'`)
+  - if the number of arguments is not `1` print (`'\n'`)
 
-- Write a program that takes a number and prints the area of the circle.
-    - The area of the circle is `π` times the radius squared.
-    - if the number is not positive or is not a number, print `Error` followed by (`'\n'`)
-    - if the number is positive, print the area of the circle followed by (`'\n'`) 
-    - if the number of arguments is not `1` print (`'\n'`)
-    - You may assume that the value of `π` is 3.14
 
 ###  Usage
 
@@ -15,7 +14,7 @@
 $ go run . | cat -e
 $
 $ go run . 10 | cat -e
-315$
+314$
 $ go run . 4 | cat -e
 50$
 $ go run . -10 | cat -e