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The fifth grade mathematics new curriculum study guide Volume I (People's Education Edition) page 50 expands and innovates the problem: How to find the area of the shadow on the right?
Is the side length of the small square 8?

10x10+8x8 =164 (area of large square+small square)

10X 10/2=50 (the area of the upper half of the big square)

(10+8)X8/2=72 (billet+bloom)

164-(50+72)=42 (total area-two blank areas equal the shadow area)

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