Answer:

1 Section lines in the United States are one mile apart. When surveyors originally mapped an area, for instance a township, it was their custom to divide the new township into 36 1-square-mile sections. Property ownership often followed this layout. A section is a 1-by-1-mile area.

2 The dimension line is a thin line, broken in the middle to allow the placement of the dimension value, with arrowheads at each end (see diagram below). An arrowhead is approximately 3 mm long and 1mm wide. ... An extension line extends a line on the object to the dimension line.

3 Long break lines are thin solid lines that have zigzags to indicate a break. Short break lines are thick, wavy solid lines that are drawn freehand.

4 A visible line, or object line is a thick continuous line, used to outline the visible edges or contours of an object. Hidden Line. A hidden line, also known as a hidden object line is a medium weight line, made of short dashes about 1/8” long with 1/16”gaps, to show edges, surfaces and corners which cannot be seen.

5 Extension lines continue or extend from the surface of the object and establish the size of the dimension. They do not touch the object lines and extend slightly past the dimension line. Extension lines provide a means of displaying a measurement without placing the dimension on the part.

Explanation:

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