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Class time control math answers
25m? = =5m×5m, and the side length of a big square is 5m.

16m? = =4m×4m, and the side length of a small square is 4m.

﹙5-4﹚×5÷2+4×4÷2=2.5+8= 10.5m? , the sum of the areas of the two blank triangles above.

﹙5+4﹚×4÷2=9×4÷2= 18m? , the area of the big blank triangle below.

25+ 16- 10.5- 18 = 12.5m? The shadow area is 12.5 square meters.