public class TriangleUtilities {

    public static String getRow(int numberOfStars) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < numberOfStars; i++) {
        sb = sb.append("*");
    }
    return sb.toString();
    
    }

    public static String getTriangle(int numberOfRows) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < numberOfRows; i++) {
            for (int j = 0; j <= i; j++) {
                sb.append("*");
            }
            sb.append("\n");
        }
        return sb.toString();
    } 

    public static String getSmallTriangle() { 
        StringBuilder sb = new StringBuilder();
        int count = 4;
        for (int i = 0; i < count; i++) {
            for (int j = 0; j <= i; j++) {
            sb.append("*");
            } 
            sb.append("\n");
        }
        System.out.print(sb);
        return sb.toString();
        }

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