public class TriangleUtilities {
    public static String getRow(int numberOfStars) {
        String star = "*";
        String output = "";
        int n = numberOfStars;
        for(int i =1; i<=n; i++) {
            output += String.format("%s", star);
        }
        return output;
    }

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

    public static String getSmallTriangle() {
        return getTriangle(4);
    }
    
    public static String getLargeTriangle() {
        return getTriangle(9);
    }
}