Li Ming wants to measure the height of a street lamp in the square from the ground. After dinner, the street lamp was turned on. He took a 2.8m-meter-long straight rod and tape measure and took Xiaoju

Li Ming wants to measure the height of a street lamp in the square from the ground. After dinner, the street lamp was turned on. He took a 2.8m-meter-long straight rod and tape measure and took Xiaojun to the road. Answer: known: h 1=2.8m? L 1=3.5m？ L2 = 3.5m+7m = 10.5m；

Question: h2=?

Solution:

In sunlight, the height and shadow length of the object are as follows:

h 1=2.8m？

L 1=3.5m？ L2 =10.5m.

According to the similarity, the corresponding edge is proportional to: h1H2 = l1L2; Substitution value:

h2=L2L 1？ h 1 = 10.5m 3.5m×2.8m = 8.4m。

Answer: The height of the street lamp is 8.4 meters.