Question

正三棱柱ABC-A1B1C1中，若∠BAC=90°，AB=AC=AA1,则异面直线BA1与AC1所成角等于？

Answer 1

60°

∠BAC=90°，AB=AC=AA1,则两个这样的正三棱柱，将BCC1B1这一斜边面重叠放置，则可形成一个立方体。

AC1‖BD1,BA1、BD1、A1D1三天线都是立方体三个面的对角线，所以三遍相等，即这三条线所形成的三角形是等边三角形。

Answer 2

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