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- Mathematics in the fifth grade of primary school (seeking the shadow part)
Mathematics in the fifth grade of primary school (seeking the shadow part)
See figure: divide the shadow into two parts: A and B; Part A is a triangle with bottom 2 and height 6, and part B is a triangle with bottom 5 and height 4;
So the area a=2×6÷2=6.
b=4×5÷2= 10
Shadow area =6+ 10= 16
The figure is decomposed as above.
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