18. На клетчатой бумаге с размером клетки 1 × 1 изображён треугольник. Найди его площадь.

The base of the triangle spans 4 units on the grid. The height of the triangle is 3 units. The area of a triangle is calculated as (1/2) * base * height. Therefore, the area is (1/2) * 4 * 3 = 6 square units.