🔷
Grade 3 Math · World 9: Polygon Plaza · Level 79
Parallel, Perpendicular, and Right Angles
Find parallel and perpendicular sides and right angles.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 79
- Welcome to Polygon Plaza! These two line segments are parallel. They go the same way and would never meet, like train tracks.
- These two are perpendicular. They cross to make square corners.
- A square corner is called a right angle, like the corner of a sheet of paper. A little square marks it.
- An angle smaller than a right angle is acute. An angle larger than a right angle is obtuse.
- Shapes have these too! A rectangle has 4 right angles, and 2 pairs of parallel sides. The arrows show which sides are parallel.
Georgia's K-12 Mathematics Standards:
- 3.GSR.6.1 — Identify perpendicular line segments, parallel line segments, and right angles, identify these in polygons, and solve problems involving parallel line segments, perpendicular line segments, and right angles.