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单选题
If A (-1, 1) and B (3, -1) are the endpoints of one side of square ABCD, what is the area of the square?
A
12
B
16
C
20
D
25
E
36
参考答案
参考解析
解析：
根据距离公式可得：AB²=（-1-3）²+（1-（-1））²=20，而AB又是正方形ABCD的边长，所以正方形的面积为AB²=20.
根据距离公式可得：AB²=（-1-3）²+（1-（-1））²=20，而AB又是正方形ABCD的边长，所以正方形的面积为AB²=20.
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