Question

图中多边形的周长是

The perimeter of the polygon shown is

$14$

$20$

$28$

$48$

无法由给定信息确定

cannot be determined from the information given

答案：C

知识点：周长矩形

难度评级：960

解答：

因为每个角都是直角，把边平移重组可见，水平边总共走过宽度两次，竖直边走过高度两次。因此周长等于完整 $8$ 乘 $6$ 矩形的周长，即 $2(8 + 6) = 28$ 。

答案不取决于缺口具体切在哪里。

所以正确答案是 C。

Because every angle is a right angle, sliding the edges shows that the horizontal edges together traverse the width twice and the vertical edges traverse the height twice. So the perimeter equals that of the full $8$ by $6$ rectangle, $2(8 + 6) = 28.$

The answer does not depend on exactly where the notch is cut.

Thus, the correct answer is C .

1986 AMC 8 第 13 题

答案：C

难度评级：960

解答：

其他年份的第 13 题