Apply Discovery Teaching Model to Instruct Engineering Drawing Course: Sketch a Regular Pentagon

The drawing method of a regular polygon has been explained in a variety of different methods in the relevant literatures. Most of the students against the plotting described procedure to complete the drawing step by step, but often without knowing the principle. It's important to develop a reasonable drawing scheme with simple geometry applied in the engineering drawing technology. A new model for regular pentagon (regular polygon, n=5) drawing will be developed with Discovery teaching method (as experimental group). The performance is better than Demonstrating method (as reference group) that students contrast the drawing procedure to finish a regular pentagon step by step. We chose the students of vocational high school provided with engineering background as a sample space. The pass probability for the experimental group with Discovery teaching method is p=.692 which is higher than the reference group p=.544. The golden rectangle is also applied to map the relationship of regular pentagon and developed an interest for engineering drawing.