Mathematics
Geometry
Conceptual
8–9 yrs
Types of angles
角的类型
Description
Identify acute and obtuse angles; compare and order angles up to two right angles by size
Mastery Evidence
- Classify given angles as acute, right, or obtuse
- Order four angles from smallest to largest by visual comparison
- Identify all acute and obtuse angles in a given triangle or quadrilateral
Assessment Prompt
If your child looks at the hands on a clock showing different times, can they tell you which angle between the hands is acute (sharper than a right angle) and which is obtuse (wider)?
Prerequisites 1
Right Angles & Turns
识别直角及大于/小于直角是命名锐角和钝角的先决条件
