Angles, triangles, symmetry: 4th grade math
Classify by lines and angles; line symmetry. A free 4th grade lesson plan, a question set with answers and a printable sheet with its key. Copy it and make it yours.
Lesson plan
Goal
- Students can do this: classify by lines and angles; line symmetry.
Teach (10 min)
- A right angle is a square corner, 90 degrees.
- Acute is smaller. Obtuse is bigger, up to a straight line.
- Work one example on the board while students say each step aloud, then do one together.
Practise (15 min)
- Students work the printable sheet in pairs, then alone.
- Or practise it as a game with no sign-up: https://peabody.kids/math/geom.angles?lesson=4-geom-angle-1&at=4
Exit ticket (5 min)
- Use the first three questions on the printable sheet as a slip.
Printable sheet
Name: ____________________ Date: ____________
Angles, triangles, symmetry (4th grade)
- What kind of angle is this? (Compare it to a square corner.)
- What kind of angle is this? (Compare it to a square corner.)
- What kind of angle is this? (Compare it to a square corner.)
- What kind of angle is this? (Compare it to a square corner.)
- What kind of angle is this? (Compare it to a square corner.)
- What kind of angle is this? (Compare it to a square corner.)
- What kind of angle is this? (Compare it to a square corner.)
- What kind of angle is this? (Compare it to a square corner.)
- What kind of angle is this? (Compare it to a square corner.)
- What kind of angle is this? (Compare it to a square corner.)
- What kind of angle is this? (Compare it to a square corner.)
- What kind of angle is this? (Compare it to a square corner.)
Key
- acute
- right
- right
- acute
- right
- right
- obtuse
- acute
- straight
- acute
- straight
- acute
Written by Peabody from its own skill pages. Free, no ads, no sign-in. Children can practise this on Peabody. More from teachers: teacher-shared resources.