2021 AMC 10B Fall 第 2 题

Question

下图中阴影图形的面积是多少？

What is the area of the shaded figure shown below?

4

6

8

10

12

求大三角形面积，再减去小三角形面积。

Find the large triangle area and subtract the small triangle area

两个三角形的底都是

4

。

Both triangles have base

4

阴影部分的面积是一个三角形的面积

\dfrac {4\cdot 5}2 - \dfrac{2\cdot 4}2 = 10-4

= 6

因为这是用较大三角形的面积减去较小三角形的面积得到的。

所以答案是 B。

The area is a triangle of area

\dfrac {4\cdot 5}2 - \dfrac{2\cdot 4}2 = 10-4

= 6

since we subtract the area of a smaller triangle from a larger triangle.

Thus, the answer is B .

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