Why is there a difference in the 3D drawing on a graph paper and an isometric sheet?

Dear Student
In case of a graph paper we cannot produce a clear 3D image 
however in case of isometric graph paper a clear 3D image can be formed
graph paper contains  lines making up a regular grid.
Isometric graph paper or 3D graph paper is a triangular graph paper which uses a series of three guidelines forming a 60° grid of small triangles

Regards

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