public class TriangleUtilities {
    public static String getRow(int numberOfStars) {
        StringBuilder triangle = new StringBuilder();

        for(int i=0; i<numberOfStars; i ++){
            triangle.append("*");
        }

        return triangle.toString();
    }

    public static String getTriangle(int numberOfRows) {
        StringBuilder triangle = new StringBuilder();

        for(int row=1; row<=numberOfRows; row++){
            for(int i=1; i<=row; i++){
                triangle.append("*");
            }
                triangle.append("\n");
        }

        return triangle.toString();
    }

    public static String getSmallTriangle() {
        StringBuilder triangle = new StringBuilder();

        for(int row=1; row<=4; row++){
            for(int i=1; i<=row; i++){
                triangle.append("*");
            }
                triangle.append("\n");
        }

        return triangle.toString();
    }

    public static String getLargeTriangle() {
        StringBuilder triangle = new StringBuilder();

        for(int row=1; row<=10-1; row++){
            for(int i=1; i<=row; i++){
                triangle.append("*");
            }
                triangle.append("\n");
        }

        return triangle.toString();
    }
}