What is the volume of the cube above?
(1) The surface area of the cube is 600 square inches.
(2)The length of diagonal AB is 10~$\sqrt{3}$~ inches.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
题目分析:
求立方体体积,需要求得立方体的边长,设边长为x。
(1) 已知立方体表面积为600平方英寸,每个面的面积为100平方英寸,则边长为10英寸,立方体体积为~$10^3$~=1000立方英寸。题目得解。
(2) 已知对角线AB的长为~$10\sqrt{3}$~,利用勾股定理,~$(x^2+x^2)+x^2=(10\sqrt{3})^2$~,解得~$x^2=100$~,x=10,所以立方体体积为103=1000立方英寸。题目得解。
因此,本题答案为(D),任何一个条件说明均能解题。
写给自己复习看,棱边垂直底边,所以可以用勾股
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