Update chapter-02-simple-calculations.md

Author: RozalinaZaharieva

chapter-02-simple-calculations.md

@@ -615,7 +615,7 @@ Next, test the solution locally using [**Ctrl+Shift+F10**] and by entering sampl
 Test your solution here: [https://judge.softuni.bg/Contests/Practice/Index/649#3](https://judge.softuni.bg/Contests/Practice/Index/649#3).
 
 
-### Exercise: Trapezoid аrea
+### Exercise: Trapezoid area
 
 Write a program that reads three numbers from the console **b1**, **b2** and **h** and calculates **the area of a trapezoid** with bases **b1** and **b2** and height **h**. The formula for the area of trapezoid is **(b1 + b2) * h / 2**.
 
@@ -638,9 +638,9 @@ The code on the picture is consciously blurred for you to give a thought and fin
 Test your solution here: [https://judge.softuni.bg/Contests/Practice/Index/649#4](https://judge.softuni.bg/Contests/Practice/Index/649#4).
 
 
-### Exercise: Circle Area and Perimeter
+### Exercise: Circle area and perimeter
 
-Write a program that reads from the console **a number r** r and calculates and prints **the area and perimeter of the circle**/**round** with **radius r**.
+Write a program that reads from the console **a number r** r then calculates and prints **the area and perimeter of the circle**/**round** with **radius r**.
 
 #### Sample input and output
 
@@ -651,7 +651,7 @@ Write a program that reads from the console **a number r** r and calculates and
 
 #### Hints and guidelines
 
-For the calculations you may use the following formulas:
+For the calculations, you can use the following formulas:
 -	**`Area = Math.PI * r * r`**.
 -	**`Perimeter = 2 * Math.PI * r`**.
 
@@ -660,7 +660,7 @@ For the calculations you may use the following formulas:
 Test your solution here: [https://judge.softuni.bg/Contests/Practice/Index/649#5](https://judge.softuni.bg/Contests/Practice/Index/649#5).
 
 
-### Exercise: Rectangle Area
+### Exercise: Rectangle area
 
 **A rectangle** is defined by the **coordinates** at two of its opposite angles (x1, y1) – (x2, y2). Calculate its **area and perimeter**. **The input** is read from the console. The numbers **x1, y1, x2 и y2** are given one per line. **The output** is printed on the console and it has to contain two lines, each with one number – the area and the perimeter.
 
@@ -679,7 +679,7 @@ Test your solution here: [https://judge.softuni.bg/Contests/Practice/Index/649#5
 Test your solution here: [https://judge.softuni.bg/Contests/Practice/Index/649#6](https://judge.softuni.bg/Contests/Practice/Index/649#6).
 
 
-### Exercise: Triangle Area
+### Exercise: Triangle area
 
 Write a program that reads from the console **a side and height of a triangle** and calculates its area. Use **the formula** for triangle area: **area = a * h / 2**. Round the result to **2 digits after the decimal point using `Math.round(area, 2)`**.
 
@@ -697,9 +697,9 @@ Write a program that reads from the console **a side and height of a triangle**
 Test your solution here: [https://judge.softuni.bg/Contests/Practice/Index/649#7](https://judge.softuni.bg/Contests/Practice/Index/649#7).
 
 
-### Exercise: Converter – from °C Degrees to °F Degrees
+### Exercise: Converter – from °C (Celsius) to °F (Fahrenheit)
 
-Write a program that reads **degrees on Celsius scale** (°C) and converts them to **degrees on Fahrenheit scale** (°F). Look on the Internet for a proper [formula](http://bfy.tw/3rGh "Търсене в Google"), to do the calculations. Round the result to **2 digits after the decimal point**. Here are a few examples:
+Write a program that reads **degrees on Celsius scale** (°C) and converts them to **degrees on Fahrenheit scale** (°F). Look on the Internet for a proper [formula](http://bfy.tw/3rGh "Търсене в Google"), to do the calculations. Round the result to **2 digits after the decimal point**. Here are a few sample data:
 
 #### Sample input and output
 
@@ -715,9 +715,9 @@ Write a program that reads **degrees on Celsius scale** (°C) and converts them
 Test your solution here: [https://judge.softuni.bg/Contests/Practice/Index/649#8](https://judge.softuni.bg/Contests/Practice/Index/649#8).
 
 
-### Exercise: Converter – from Radians to Degrees
+### Exercise: Converter – from  radians to degrees
 
-Write a program, that reads **ъan angle in [radians](https://bg.wikipedia.org/wiki/Радиан)** (**`rad`**) and converts it to **[degrees](https://bg.wikipedia.org/wiki/Градус_(ъгъл))** (`deg`). Look for a proper formula on the Internet. The number **π** in Java programs is available through **``Math.PI``**. Round the result to the nearest integer using the method **``Math.round(…)``**.
+Write a program, that reads **an angle in [radians](https://en.wikipedia.org/wiki/Radian)** (**`rad`**) and converts it to **[degrees](https://en.wikipedia.org/wiki/Degree_(angle))** (**`deg`**). Look for a proper formula on the Internet. The number **π** in Java programs is available through **``Math.PI``**. Round the result to the nearest integer using the method **``Math.round(…)``**.
 
 #### Sample input and output
 
@@ -735,7 +735,7 @@ Test your solution here: [https://judge.softuni.bg/Contests/Practice/Index/649#9
 
 ### Exercise: Converter – USD to BGN
 
-Write a program for **conversion of US dollars** (USD) **into Bulgarian levs** (BGN). **Round** the result **2 digits** след десетичния знак. after the decimal point. Use a fixed rate between a dollar and levs: **1 USD = 1.79549 BGN**.
+Write a program for **conversion of US dollars** (USD) **into Bulgarian levs** (BGN). **Round** the result **2 digits** after the decimal point. Use a fixed rate between a dollar and levs: **1 USD = 1.79549 BGN**.
 
 #### Sample input and output
 
@@ -750,15 +750,15 @@ Write a program for **conversion of US dollars** (USD) **into Bulgarian levs** (
 Test your solution here: [https://judge.softuni.bg/Contests/Practice/Index/649#10](https://judge.softuni.bg/Contests/Practice/Index/649#10).
 
 
-### Exercise:	\* Currency Converter
+### Exercise:	\* Currency converter
 
 Write a program for **conversion of money from one currency into another**. It has to support the following currencies: **BGN, USD, EUR, GBP**. Use the following fixed currency rates:
 
-|  Course  |   USD   |   EUR   |   GBP   |
+|  Exchange rate  |   USD   |   EUR   |   GBP   |
 |:------:|:-------:|:-------:|:-------:|
 | 1 BGN  | 1.79549 | 1.95583 | 2.53405 |
 
-**The input** is **sum for conversion**, **input currency** and **output currency**. **The output** is one number – the converted value of the above currency rates, rounded **2 digits** after the decimal point. 
+**The input** consists of three lines - the first is **a sum for conversion**, the second is the **input currency**, and the third is **output currency**. **The output** is one number – the converted value according to the above exchange rates, rounded **2 digits** after the decimal point. 
 
 #### Sample input and output
 
@@ -774,9 +774,9 @@ Write a program for **conversion of money from one currency into another**. It h
 Test your solution here: [https://judge.softuni.bg/Contests/Practice/Index/649#11](https://judge.softuni.bg/Contests/Practice/Index/649#11).
 
 
-### Exercise: ** Date Calculations – 1000 Days on the Earth
+### Exercise: ** Date calculations – 1000 days on the Earth
 
-Write a program that enters a **birth date** in format **`dd-MM-yyyy`** and calculates the date on which **1000 days** are turned since this birth date and prints it in the same format.
+Write a program that reads from the console a **birth date** in format **`dd-MM-yyyy`** then calculates the date on which **1000 days** are turned since this birth date, and prints the output in the same format.
 
 #### Sample input and output
 
@@ -789,7 +789,7 @@ Write a program that enters a **birth date** in format **`dd-MM-yyyy`** and calc
 |14-06-1980|11-03-1983|
 
 #### Hints and guidelines 
-  * Look for information about the data type **`Date`**, **`Calendar`** and **`SimpleDateFormat`** in Java and in particular look at the methods **`Calendar.setTime(date)`**, **`Calendar.add(countDays)`** and **`SimpleDateFormat.format(date)`**. With their help you can solve the problem without the need to calculate days, months and leap years.
+  * Look for information about the types **`Date`**, **`Calendar`** and **`SimpleDateFormat`** in Java and in particular look at the methods **`Calendar.setTime(date)`**, **`Calendar.add(countDays)`** and **`SimpleDateFormat.format(date)`**. With their help, you can solve the problem without the need to calculate days, months, and leap years.
   * **Don't print** anything additional on the console except for the wanted date!
 
 #### Testing in the Judge system