Update 03_booleans_operators_date.md

Correction on triangle area calculation

03_Day_Booleans_operators_date/03_booleans_operators_date.md

@@ -553,7 +553,7 @@ console.log(`${date}/${month}/${year} ${hours}:${minutes}`) // 4/1/2020 0:56
    ```sh
    Enter base: 20
    Enter height: 10
-   The area of the triangle is 50
+   The area of the triangle is 100
    ```
 
 1. Write a script that prompt the user to enter side a, side b, and side c of the triangle and and calculate the perimeter of triangle (perimeter = a + b + c)