Mathematics
Geometry
Procedural
12–14 yrs
Understanding angles (age 12+)
认识角（12岁以上）
Description
Use ruler and compasses to perform standard constructions: perpendicular bisector of a line segment, perpendicular to a line from or at a given point, and bisecting an angle
Mastery Evidence
- Construct the perpendicular bisector of a line segment using compasses and a straight edge
- Construct an angle bisector and verify by measuring both halves
- Construct a perpendicular from a point to a line using compasses only
Assessment Prompt
If your child has only a ruler and a pair of compasses, can they construct a line that cuts another line segment exactly in half at a right angle — without using a protractor?
Prerequisites 1
Measuring angles (age 11+)
圆规作图首先需要具备自信的绘图和测量技能
Unlocks 0
No follow-up topics
