Question

这个图形的面积是 $100 \text{ cm}^2$ 。它的周长是

（该图形由四个全等正方形组成。）

The area of this figure is $100 \text{ cm}^2.$ Its perimeter is

(The figure consists of four identical squares.)

$20 \text{ cm}$

$25 \text{ cm}$

$30 \text{ cm}$

$40 \text{ cm}$

$50 \text{ cm}$

知识点：面积周长

每个小正方形的面积是 $\dfrac{100}{4} = 25 \text{ cm}^2$ ，所以边长是 $5 \text{ cm}$ 。

这个阶梯形的外边界由 $10$ 条这样的边组成，所以周长是 $10 \cdot 5 = 50 \text{ cm}$ 。

所以正确答案是 E。

Each of the four squares has area $\dfrac{100}{4} = 25 \text{ cm}^2$ , so each side is $5 \text{ cm}.$

The outline of this staircase shape is made up of $10$ such sides, so the perimeter is $10 \cdot 5 = 50 \text{ cm}.$

Thus, the correct answer is E .