AMC12 2010 B

AMC12 2010 B · Q2

AMC12 2010 B · Q2. It mainly tests Area & perimeter.

A big $L$ is formed as shown. What is its area?

如图所示，形成了一个大 $L$ 形。其面积是多少？

(A) 22 22

(B) 24 24

(D) 28 28

(E) 30 30

Answer

Correct choice: (A)

正确答案：（A）

Solution

We find the area of the big rectangle to be $8 \times 5 = 40$, and the area of the smaller rectangle to be $(8 - 2) \times (5 - 2) = 18$. The answer is then $40 - 18 = 22$ $(A)$.

大矩形的面积为 $8 \times 5 = 40$，小矩形的面积为 $(8 - 2) \times (5 - 2) = 18$。因此答案为 $40 - 18 = 22$ $(A)$。

Topics

GE.007 Area & perimeter