What ARE THE weak links in this chain ?

Link between G & H is Weak link

G and H is a weak link because both are not connected properly.

The correct answer is between A and C.

B is the answer.

How many four sided shapes are in this diagram?

They are eight look-alikes brothers. They considered to be weak, yet they protect the king in every battle. If they move ahead, they never turn back.

Who are they?

In the diagram angle ACB, AED, and BDC are right angles, CD = 60, and the area of triangle ABC is 3750. Find the perimeter of triangle CDE.