IXL | Learn 2nd grade math WebIXL offers hundreds of second grade math skills, lessons, and games to explore and learn! Not sure where to start? Go to your personalized ... Name polygons: up to 12 sides 6. Flip, turn, and slide 7. Identify congruent shapes 8. Symmetry 9. Identify lines of symmetry 10. Compose two-dimensional shapes U. Three-dimensional shapes. 1. Name the three …