Below is a video lesson along with printable works.
Notes: (1) If your child does not remember a name of a triangle from Part I, include it in the new presentation with the Three Period Lesson. (2) Make it fun with different commands and movements so that the child can build their muscular memory. (3) When your child masters all the names you can play the Bring Me Game (Your child will hide three of them, ask him or her to bring you a particular one; ask what he or she brought; say the correct name; ask him or her to put it back; and continue the game. (4) On another day show your child the Three Part Cards, this is another way to continue building memory.
Want more? Here are some Supplemental Materials from other sources.