Question

Genevieve 在她的大风筝上加支撑条，形式是连接风筝相对顶点的十字。她需要多少英寸支撑材料？

Genevieve puts bracing on her large kite in the form of a cross connecting opposite corners of the kite. How many inches of bracing material does she need?

$30$

$32$

$35$

$38$

$39$

答案：E

知识点：长度、面积与体积的缩放关系对角线

难度评级：960

解答：

长对角线是 $7$ 个单位，短对角线是 $6$ 个单位。

在大风筝中，一个单位为 $3$ 英寸，所以需要的支撑材料总长为 $3(7 + 6) = 3 \cdot 13 = 39 \text{ in.}$

所以正确答案是 E。

The long diagonal is $7$ units, and the short one is $6$ units.

In the large kite, one unit is $3$ inches, so the total amount of bracing material needed is $3(7 + 6) = 3 \cdot 13 = 39 \text{ in.}$

Thus, E is the correct answer.

2001 AMC 8 第 8 题

答案：E

难度评级：960

解答：

其他年份的第 8 题