根据线的特征对图形分类
Classifying shapes by line properties
根据平面图形中是否存在平行线、垂直线或指定大小的角，对图形进行分类；认识直角三角形这一类别。
Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines, or angles of a specified size; recognise right triangles as a category
学习证据 / Evidence
- 把一组四边形分成有平行边的和没有平行边的
- 从一组三角形中找出哪些是直角三角形
- 对既有垂直边又有平行边的图形进行分类
- Sort a set of quadrilaterals into those with parallel sides and those without
- Identify which triangles in a set are right triangles
- Classify shapes that have both perpendicular and parallel sides
评估问题 / Assessment
如果你向{{name}}展示一组混合的三角形和四边形，他们能否把它们分成几类——例如“至少有一个直角的图形”或“有平行边的图形”——并解释他们的理由？
If you show {{name}} a mixed set of triangles and quadrilaterals, can they sort them into groups — like "shapes with at least one right angle" or "shapes with parallel sides" — and explain their reasoning?