public class TriangleUtilities {

    public static String getRow(int numberOfStars) {
        StringBuilder builder = new StringBuilder();
        for(int i=1; i<=numberOfStars; i++){
            builder.append('*');
        }
        return builder.toString();
    }
    
    public static String getTriangle(int numberOfRows) {
        StringBuilder builder = new StringBuilder();
        for(int i=1; i<=numberOfRows; i++){
            String x = getRow(i);
            builder.append(x + "\n");
        }
        return builder.toString();
    }


    public static String getSmallTriangle() {
        StringBuilder builder = new StringBuilder();
        for(int i=1; i<=4; i++){
            String x = getRow(i);
            builder.append(x + "\n");
        }
        return builder.toString();
    }

    public static String getLargeTriangle() {
        StringBuilder builder = new StringBuilder();
        for(int i=1; i<=9; i++){
            String x = getRow(i);
            builder.append(x + "\n");
        }
            
        return builder.toString();
    }
}