public class TriangleUtilities {

    public static String getRow(int numberOfStars) {
        StringBuilder stringStars = new StringBuilder();
        for (int i = 0; i < numberOfStars; i++) {
        stringStars.append("*");
        }
        return stringStars.toString();
    }
    
    public static String getTriangle(int numberOfRows) {
        StringBuilder strStars = new StringBuilder();
        for (int i = 0; i <numberOfRows; i++) 
        {
            for (int j = 0; j <= i; j++) 
            {
                if (j<=i)
                strStars.append("*");
            }
        strStars.append("\n");
        }
        return strStars.toString();
    }
    public static String getSmallTriangle() {
        StringBuilder strStars = new StringBuilder();    
        for (int i = 0; i <4; i++) 
            {
            for (int j = 0; j <= i; j++) 
               {
                if (j<=i)
                strStars.append("*");
                }
            strStars.append("\n");
        }
        return strStars.toString();
    }

    public static String getLargeTriangle() {
        StringBuilder strStars = new StringBuilder();    
        for (int i = 0; i <9; i++) {
            for (int j = 0; j <= i; j++)  {
                if (j<=i) {
                    strStars.append("*");
                }
            }
            strStars.append("\n");
        }
        return strStars.toString();
    }
}