Delete triangle.java

jshERP-boot/src/main/java/com/jsh/erp/utils/triangle.java

-package com.jsh.erp.utils;
-
-public class Triangle extends Shape {
-	@Override
-	public double area(double length,double width) {
-	System.out.println ("triangle ~area");
-	return 1.0/2*length*width;
-}
-}
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