Xiaoli's home is 1km away from the north-east 30th direction of the school, and the park is 1km away from the east of the school. How many kilometers.
小丽家在学校北偏东30方向1千米处，公园在学校正东方向1千米处，小丽从家走到学校，再从学校走到公园，然后从公园回家，至少要走多少千米．
<gadget id="calculator">1 + 1 + 1</gadget>
<output>3</output>

<result>3</result>