The diagram shows an equilateral triangle ABC and an isosceles triangle BCD. AB = AC=BC=CD.
Angle ABD = x°
Express the size of angle ACD in terms of xº, giving your answer as simply as possible.
Give a reason for each step in your working.

Narrow specialization of tasks within a production process so that each worker can become a specialist in doing one thing, especially on an assembly line. In traditional industries (see sunset industries), division of labor is a major motive force for economic-growth. However, in the era of mass customization (which requires multiple skills and very short machine change-over time), division of labor has become much more flexible. Also called specialization of labor.

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