Question

一个正方形和一个三角形的周长相等。三角形三边长分别为 $6.2$ 厘米、 $8.3$ 厘米和 $9.5$ 厘米。这个正方形的面积是多少平方厘米？

A square and a triangle have equal perimeters. The lengths of the three sides of the triangle are $6.2$ cm, $8.3$ cm, and $9.5$ cm. The area of the square, in square centimeters, is

$24 \text{ cm}^2$

$36 \text{ cm}^2$

$48 \text{ cm}^2$

$64 \text{ cm}^2$

$144 \text{ cm}^2$

答案：B

知识点：周长正方形（几何）

难度评级：730

解答：

三角形周长是 $6.2 + 8.3 + 9.5 = 24$ 厘米，所以正方形周长也是 $24$ 厘米。

正方形边长是 $\dfrac{24}{4} = 6$ 厘米，因此面积是 $6^2 = 36 \text{ cm}^2$ 。

所以正确答案是 B。

The triangle's perimeter is $6.2 + 8.3 + 9.5 = 24$ cm, so the square also has perimeter $24$ cm.

The square's side is $\dfrac{24}{4} = 6$ cm, so its area is $6^2 = 36 \text{ cm}^2.$

Thus, the correct answer is B .

1985 AMC 8 第 12 题

答案：B

难度评级：730

解答：

其他年份的第 12 题