The manager of a local grocery store introduces a short conveyor belt that allows customers to place items on it prior to checking out. this saves the cashier from the physical strain of bending forward and reaching into the carts to retrieve the items. this change is an example of the approach to job design.

Ergonomic

Explanation:

According to a different source, these are the options that come with this question:

This is an example of the ergonomic approach to job design. In this example, the manager of the local grocery store has changed a particular design in the store in order to reduce the physical strain on the cashier. Ergonomics refers to the act of designing the workplace in order to better suit the needs of the workers.

bd = 9 cm

step-by-step explanation:

in a 30°-60°-90° triangle, the ratio of side lengths is 1 : √3 : 2. that is, the longest side (hypotenuse) is twice the length of the shortest side.

all of the triangles in your geometry are 30°-60°-90° triangles. ac is the hypotenuse of δacd, and the short side of δabc.

the short side ad of δacd will be half the length of ac, so 3 cm. the hypotenuse ab of δabc will be twice the length of ac, so 12 cm. segment bd is the difference of the lengths ab and ad, so is

bd = ab -ad

bd = 12 cm - 3 cm = 9 cm

comment on side length ratios

you can figure the ratios of side lengths in a 30°-60°-90° triangle by considering the trig ratios of the angles. or you can figure the length of the altitude of an equilateral triangle of side length 2 using the pythagorean theorem.

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