2 The square of the area on the radius =3. 14

Question 2: Draw a picture yourself, and you will find it is a straight line. The reason why the ratio is proportional is that the shadow length ratio is higher than 0.6.

Tree height: the shadow length ratio of 2.4m is 0.6 = 4m.

Shadow length: 9 meters high multiplied by 0.6=5.4 meters.

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