2024年河北省初中毕业生升学文化课考试（十）数学.考卷答案试卷答案,我们目前收集并整理关于2024年河北省初中毕业生升学文化课考试（十）数学.考卷答案得系列试题及其答案，更多试题答案请关注本网站↓↓↓
2024年河北省初中毕业生升学文化课考试（十）数学.考卷答案试卷答案
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分析由题意直线l1：x+2y=a+2和直线l2：2x-y=2a-1，交于圆心（a，1），且互相垂直，可得四边形ABCD是正方形，即可求出四边形ABCD的面积．
解答解：由题意，直线l1：x+2y=a+2和直线l2：2x-y=2a-1，交于圆心（a，1），且互相垂直，
∴四边形ABCD是正方形，
∴四边形ABCD的面积为4×$\frac{1}{2}×2×2$=8，
故选：D．
点评本题考查求四边形ABCD的面积，考查学生的计算能力，确定直线l1：x+2y=a+2和直线l2：2x-y=2a-1，交于圆心（a，1），且互相垂直是关键．
