A square lot is to be planted with santan plants all around the side of the lot measures 10m if plants will be planted 20cm apart, how many plants must be planted in all

First, we need to calculate the perimeter of the square lot. Since all sides are equal in a square, we can simply multiply the side length by 4.

Perimeter = 10m x 4 = 40m

Since the plants will be planted 20cm apart, we need to convert the unit of measurement to meters for consistency.

20cm = 0.2m

Now, we can determine how many plants will be planted along the perimeter by dividing the perimeter by the spacing of the plants.

Number of plants = 40m / 0.2m = 200 plants

Therefore, a total of 200 santan plants must be planted all around the square lot.