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

40/0.2 = 200

2500 santan plant

To find the number of plants that need to be planted, we need to determine the total perimeter of the square lot and then divide it by the distance between each plant.

Given that the side of the square lot measures 10 m, we know that the perimeter of a square is calculated by multiplying the side length by 4. Thus, the perimeter of this lot is 10 m * 4 = 40 m.

Next, we need to convert the distance between each plant to meters, as the side length of the lot is in meters. Since 1 meter is equal to 100 centimeters, 20 cm is equal to 20 cm / 100 cm/m = 0.2 m.

Now we can calculate the number of plants required by dividing the perimeter of the lot by the distance between each plant: 40 m / 0.2 m/plant = 200 plants.

Therefore, 200 plants must be planted in total.