新SAT官方Daily Practice每日一题数学函数题
- 2017年07月28日13:35 来源:小站教育作者:小站SAT编辑
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Mathematics>Standard Multiple Choice
Read the following SAT test question and thenclick on a button to select your answer.
In the figure shown above, BD bisects AC at point B. What is the perimeter of quadrilateralAECD?
A.48cm
B.46cm
C.38cm
D.34cm
重点单词:
congruent ['kɔŋgruənt] adj. 合适的,一致的,全等的
segment ['segməntn. 部份,瓣,弓形vt. 分割
perimeter [pə'rimitə] n. 周长,周界,边缘
figure ['figə] n. 图形,数字,形状; 人物,外形,体型
diagram ['daiəgræm] n. 图解,图表 vt. 用图解法表示
perpendicular [.pə:pən'dikjulə] n. 垂直线 adj. 垂直的,直立的,陡峭的
multiple ['mʌltipl] adj. 许多,多种多样的
答案:A
解析:
We can see from the diagram that the bisector BDintersects AC at a right angle, so the segments areperpendicular to each other.
Any point on a segment's perpendicular bisector isequidistant from the segment's two endpoints. Labeling the congruent line segments yieldsthe following figure:
To find the perimeter of quadrilateral AECD, add the lengths of each side.
16+16+8+8=48
The perimeter of quadrilateral AECD is 48cm.