Question

how to teach 2 d shapes

Answer 1

It's very simple.

See, to understand the concept of 2-D shapes there are things to notice.

now I will tell you how to teach it in the best method you can do see first say that let's take a point on a board and and extend it from both the sides as a line does now make a linear line above it and connect it we will end up with the 2D shape as we started from a point then you extended it and make a perpendicular to the linear side of it above it so this way you can do it very easily

Thai auto also explain with some examples that will also help