爱情遗失在深圳
幼苗
共回答了17个问题采纳率:94.1% 举报
我练练用英语答第一问!the edge of the cube is a (设正方形棱长a) the ankle between AB1 and A1D is equal to AB1 and B1C because the relationship between B1C and A1D is parallel.(AB1与A1D所成的角就是AB1与B1C所成的角因为B1C和A1D互为平行.)AB1=B1C=AC=√2aso the value of the ankle between AB1 and A1D is 60°(所以AB1和A1D成60°角)第二问好像不是平行!
1年前
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