Answer:
24 centimeters
Step-by-step explanation:
You can just count the squares around the rectangle since each of those squares is a centimeter. Hence the name centimeter grid.
 
        
             
        
        
        
It is best to use mental math with some equations (5x5 or something that is easy enough that work does not have to be shown 10 dived by 5
        
             
        
        
        
You solve by with by altitude! Hope it helps
        
                    
             
        
        
        
To calculate the volume of the rectangular prism and the triangular prism you will multiply the area of the base by the height of the prism.
1.  V = BH
     V = lwH
           12 x 8 x 4
     V = 384 cubic inches
2.   V = BH
      V = 1/2bhH
            1/2 x 12 x 2 x 18
      V = 216 cubic feet
        
                    
             
        
        
        
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