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AMC12 2013 A

AMC12 2013 A · Q1

AMC12 2013 A · Q1. It mainly tests Triangles (properties), Area & perimeter.

Square $ABCD$ has side length 10. Point $E$ is on $\overline{BC}$, and the area of $\triangle ABE$ is 40. What is $BE$?
正方形 $ABCD$ 的边长为 10。点 $E$ 在 $\overline{BC}$ 上,$\triangle ABE$ 的面积为 40。$BE$ 等于多少?
stem
(A) 4 4
(B) 5 5
(C) 6 6
(D) 7 7
(E) 8 8
Answer
Correct choice: (E)
正确答案:(E)
Solution
The area of $\triangle ABE$ is $\frac{1}{2} \times AB \times BE = \frac{1}{2} \times 10 \times BE = 40$, so $BE = 8$.
$\triangle ABE$ 的面积为 $\frac{1}{2} \times AB \times BE = \frac{1}{2} \times 10 \times BE = 40$,因此 $BE = 8$。
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