题目

听短文,根据短文内容完成下列句子 (1) It's 10:00 a.m. My friends and I are. (2) Linda and Lisa are at the pool. (3) Nancy is . (4) Peter and I are. (5) My dog, Jack, is . 答案:【1】in the park 【1】swimming 【1】reading a book 【1】playing chess 【1】running如图,已知半圆的直径为,以一边作正方形,是半圆上一点,且=,连接交半圆于点⑴试判断直线与圆的位置关系,并证明你的结论;⑵当关系式成立时,求∠的度数;⑶若正方形边长为,延长交延长线于点,试计算出线段的长.
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