A(n) is a formal, documented process that describes when and how official project documents may be modified, the people authorized to make modifications, and the paperwork required for these changes. a. project charter b. change control system c. performance report d. WBS

A change control system.

Explanation:

A change control system is used to guarantee objectivity when a change is made to an official document. This process can be carried out through a formal document, describing what will be modified, when and how it will be done. It will also detail who will be authorized to make the change.

The purpose of the process is to ensure that the process is done legally, carefully and approved by the parties involved.

I hope this information can help you.

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.

i this its 7 years i hope this