角的估算
Estimating Angles
用度数估算和比较锐角、钝角和优角；对角按类型分类，并按大小排列。
Estimate and compare acute, obtuse, and reflex angles in degrees; classify angles by type and order them by size
学习证据 / Evidence
- 将一个角估算为约130°，并将其判断为钝角。
- 在图形中找出一个优角，并估算它约为270°。
- 测量前先通过估算把四个角从小到大排序。
- Estimate an angle as approximately 130° and classify it as obtuse
- Identify a reflex angle in a diagram and estimate it as about 270°
- Order four angles from smallest to largest by estimation before measuring
评估问题 / Assessment
如果你在纸上给{{name}}展示三个不同的角，{{name}}能估算出哪个角最大，判断每个角是锐角、钝角还是优角，然后再用量角器检查吗？
If you show {{name}} three different angles drawn on paper, can they estimate which is biggest, label each as acute, obtuse, or reflex — and then check with a protractor?