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What is 'pbr3' ??? If you mean the chemical phosphorus bromide , the formula is 'PBr3'. NOTE the use of Capital letters. Ther shape is pyrsmidal, similarl to its group analogy ammonia.
No. Examples of shapes without lines of symmetry include a scalene triangle, a parallelogram, the capital letters F and J.
A rhomboid, possibly. The names of 3-d shapes with plane faces end in the suffix -hedron. If the name is to have 8 letters, that leaves only 2!
There is no such shape.
A 2D shape that has four sides and is thirteen letters long is a quadrilateral.