新SAT官方Daily Practice每日一题数学推理题

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Read the following SAT test question and then click on a button to select your

answer.

8月SAT数学官方Daily Practice 每日一练，点击

Sarah has a rectangular swimming pool that measures 12 feet(ft) by 72ft across

the surface. To the nearest foot, what is the diagonal distance across the

surface of the pool?

A.60ft

B.71ft

C.73ft

D.84ft

重点单词：

calculate ['kælkjuleit]v. 计算，估计，核算，计划，认为

diagonal [dai'ægənl]adj. 对角线的，斜的，斜纹的 n. 对角线，斜线，斜

negative ['negətiv]adj. 否定的，负的，消极的n. 底片，负

context ['kɔntekst]n. 上下文，环境，背景

rectangular [rek'tæŋgjulə]n. 矩形

multiple ['mʌltipl]adj. 许多，多种多样的

答案：C

解析：

Choice C is correct. The Pythagorean theorem can beused to calculate the

diagonal length of theswimming pool surface where a and b are the sidelengths of

the pool surface.

c²=a²+b²=12²+72²=5328, c≈±73

A negative distance is not possible in this context, so the diagonal distance

across the swimming pool surface is about 73ft.