In the non-convex quadrilateral ABCD shown below, BCD is a right angle, AB=12, BC=4, CD=3, and AD=13. What is the area of quadrilateral ABCD?

AMC 8 2017 Problem 18

AMC8 2017 年第 18 题

面积与周长（综合）★★★☆☆

In the non-convex quadrilateral ABCD shown below, \angle BCD is a right angle, AB=12, BC=4, CD=3, and AD=13. What is the area of quadrilateral ABCD?

在如下图所示的非凸四边形 ABCD 中， AD=13.那么四边形 ABCD 的面积是多少？

正确答案 · Correct Answer

解析整理中

继续练习