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From group 3, ict 2 pere at Olongapo City National High School, Ict in the Philippines,  we had the following picture as a suggestion for the completion.

We had, from Harry at Stonebroom, the following:

I think that every side will have a triangle to make it a star

and from Ayesha from Gag in Pakistan we received this similar suggestion:

On the plan side we will add a triangle because it will be in the same form
from every side