Small-group support
The height on the net is the height of the triangular face.
A square pyramid has base side 6 and face height 4 on the net.
The net uses the height of each triangular face. That height is not the vertical height inside the pyramid. Surface area adds the base and the faces.
Problem 1 of 4. A short entry task, a model, guided examples, then a new independent try. Frames are optional.