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Mathematics problems in the fifth grade of primary school. How much is the area of shadow triangle in ① larger than that in ②? The unit is centimeters.
Let the base of the triangle in the shadow (2) be x.

According to the triangle similarity: x/6 = 3/(3+4), x= 18/7.

The base (top) of the triangle in the shadow (1) = 6- 18/7=24/7.

Shadow (1) Triangle area = 1/2*24/7*4 = 48/7.

Shadow (2) Triangle area = 1/2* 18/7*3 = 27/7.

48/7-27/7 = 2 1/7 = 3

In the figure, the shaded triangle area of ① is 3 square centimeters larger than ②.

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