Rich is 1.5 meters tall and cast a 0.75 meter shadow. At the same time a nearby flagpole cast a 3 meter shadow. How tall is the flagpole?

1.5/0.75 = x/3

0.75x = 4.5

x = 6 meters

To find the height of the flagpole, we can use the concept of similar triangles. The ratio of the corresponding sides of two similar triangles is equal. In this case, we can set up the following proportion:

Height of Rich / Length of Rich's shadow = Height of flagpole / Length of flagpole's shadow

Plugging in the given values:

1.5 meters / 0.75 meters = Height of flagpole / 3 meters

Now we can solve for the height of the flagpole:

1.5 meters / 0.75 meters = Height of flagpole / 3 meters

(1.5 meters * 3 meters) / 0.75 meters = Height of flagpole

4.5 meters / 0.75 meters = Height of flagpole

6 meters = Height of flagpole

Therefore, the flagpole is 6 meters tall.