With reference to fig 12.17:
(i) Write the name of all the edges. How many edges are there in all?

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Solution

Edges are denoted by the lines in the oblique sketch
So,
Edge A-B , Edge B-C , Edge C-D, Edge A-D, Edge B-F, Edge E-F, Edge A-E, Edge G-C, Edge G-F, Edge H-E , Edge H-D, Edge G-H.
The given solid have 12 Edges

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