The city is planning to plant a certain number of trees for every square meter of a triangle-shaped park. Compose a rectangle to find the area of the park. What is the area of the park in square meters?

To find the area of the park, we need to first find the area of the triangle-shaped park.

Let's assume the base of the triangle is 10 meters and the height is 5 meters.

The area of a triangle can be calculated using the formula: 1/2 * base * height

So, the area of the triangle-shaped park is: 1/2 * 10 * 5 = 25 square meters

Now, if the city is planning to plant a certain number of trees for every square meter of the park, and let's say they are planting 2 trees per square meter, we can calculate the total number of trees to be planted as follows:

Total number of trees = area of the park * number of trees per square meter
Total number of trees = 25 * 2 = 50 trees

Therefore, the area of the park is 25 square meters and the total number of trees to be planted is 50.