import java.util.Scanner;

public class areaCalculator {

	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		System.out.println(
				"Hello. I am a calculator that can calculate the area of shapes. All I need is for you to input what shape's area\nyou would like to convert from the following list: \n");
		System.out.println("•triangle\n•circle\n•rectangle\n•square\n•trapezoid\n");
		String shapeName = input.nextLine();
		if (shapeName.equals("triangle")) {
			System.out.println("What is the base of the triangle? ");
			double triangleBase = input.nextDouble();
			System.out.println("What is the height of the triangle? ");
			double triangleHeight = input.nextDouble();
			System.out.println("The area of the triangle is: " + (triangleBase * triangleHeight) / 2);

		} else if (shapeName.equals("circle")) {
			System.out.println("What is the radius of the circle? ");
			double radius = input.nextDouble();
			System.out.println("The area of the circle is: " + Math.PI * Math.pow(radius, 2));
		} else if (shapeName.equals("rectangle")) {
			System.out.println("What is the height of the rectangle? ");
			double rectangleHeight = input.nextDouble();
			System.out.println("What is the width of the rectangle? ");
			double rectangleWidth = input.nextDouble();
			System.out.print("The area of the rectangle is: " + rectangleHeight * rectangleWidth);

		} else if (shapeName.equals("square")) {
			System.out.println("What is the length of one side of the square? ");
			double squareSide = input.nextDouble();
			System.out.println("The area if the square is: " + Math.pow(squareSide, 2));
		} else if (shapeName.equals("trapezoid")) {
			System.out.println("What is one of the bases of the trapezoid? ");
			double tBase1 = input.nextDouble();
			System.out.println("What is another of the bases of the trapezoid? ");
			double tBase2 = input.nextDouble();
			System.out.println("What is the height of the trapezoid? ");
			double tHeight = input.nextDouble();
			System.out.println("The area of the trapezoid is: " + (tBase1 + tBase2) / 2 * tHeight);

		} else {
			System.out.println("Sorry. An error occured. Please try again");
		}
	}

}