## Area Calculator
### Instructions
Create a class `AreaCalculator` that has an overloaded method `calculate` to calculate the area of different shapes. The method should be able to calculate the area for:
- A circle (given the radius)
- A rectangle (given the width and height)
- A triangle (given the base and height)
- A square (given the side length)
#### Formulas for area calculations:
- Circle: Area = 𝜋 × radius²
- Rectangle: Area = width × height
- Triangle: Area = ½ × base × height
- Square: Area = side²
> you can use `Math.PI`
### Expected Class
```java
import java.lang.Math;
public class AreaCalculator {
public double calculate(double radius) {
// calculate area of circle
}
public double calculate(double width, double height) {
// calculate area of rectangle
}
public double calculate(double base, double height, boolean isTriangle) {
// calculate area of triangle
}
public double calculate(double side, boolean isSquare) {
// calculate area of square
}
}
```
### Usage
Here is a possible `ExerciseRunner.java` to test your class:
```java
public class ExerciseRunner {
public static void main(String[] args) {
AreaCalculator calculator = new AreaCalculator();
// Test calculate area of a circle
double circleArea = calculator.calculate(5.0);
System.out.println("Area of circle: " + circleArea);
// Test calculate area of a rectangle
double rectangleArea = calculator.calculate(4.0, 6.0);
System.out.println("Area of rectangle: " + rectangleArea);
// Test calculate area of a triangle
double triangleArea = calculator.calculate(4.0, 6.0, true);
System.out.println("Area of triangle: " + triangleArea);
// Test calculate area of a square
double squareArea = calculator.calculate(4.0, true);
System.out.println("Area of square: " + squareArea);
}
}
```
### Expected Output
```shell
$ javac *.java -d build
$ java -cp build ExerciseRunner
Area of circle: 78.54
Area of rectangle: 24.0
Area of triangle: 12.0
Area of square: 16.0
$
```
