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What is meant by the development of a surface?

  • A.the surface unrolled flat without stretching or tearing
  • B.the surface projected onto a principal plane of projection
  • C.the surface drawn pictorially in an isometric view
  • D.the surface cut into sections at regular intervals

Answer: A

Every element of the surface keeps its true length and every area its true size, so the flat pattern can be cut from sheet and folded up to the original form. It is the drawing a sheet-metal worker actually works from, which is why no dimension in it may be foreshortened.

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