空间中的角和距离是数学竞赛的考点之一,一般以选择题和填空题的形式出现,主要考查基本概念和空间点、线、面之间的位置关系,解题以通性通法为主.空间中的角包括异面直线所成的角、直线和平面所成的角、二面角.求异面直线所成的角,通常在其中一条直线上选取一点,将另一条直线平 The corners and distances in space are one of the test points for math competitions. They usually appear in the form of multiple-choice questions and blank-fill questions. They mainly examine the basic concepts and the positional relationship between spatial points, lines, and faces. The general problem-solving approach is The angles in the main space include the angles formed by different straight lines, the angles formed by straight lines and planes, and the dihedral angles. Find the angles formed by the straight lines on different sides. Usually select one point on one of the straight lines and the other on a straight line.