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Answer:
 144cm²
Explanation:
Given dimensions: 
      Length x breadth x thickness 
         18cm  x   8cm    x    5cm 
The widest part of this figure will be the face containing the length and the breadth. 
The breadth is the width of the figure; 
Area of the widest part  = length x breadth = 18cm x 8cm  = 144cm
The area of the widest part of the figure is  144cm²
 
        
             
        
        
        
<span>The unit cell of amazonite is made of three pairs of faces, each pair different from the others. The faces are oriented at angles to one another that are not 90 degrees. The type of crystal this is is triclinic.
Triclinic crystal system is one of the seven crystal systems, with three basis vectors. </span>