Perfect Reasoning by Tiro Phenyo Nkau - HTML preview
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19. The hollow box area
The measurement of the hollow box can be noted down as its frontal area multiplied by two plus its left area multiplied by two plus its base multiplied by two.
Measurement Formula: (Frontal area × 2) + (Left area × 2) + (Base area × 2) 20. The hollow cube area
The hollow cube has even dimensions. Because of this it's measurement can easily be noted down as the area of one of its sides multiplied by six.
Measurement Formula: width² × 6