Question

От прямоугольной пластины со сторонами 3 см и 9 см отрезали прямоугольник со сторонами 2 см и 4 см (смотри рисунок). Найдите: площадь оставшейся части пластины

Answer 1

3х9=27см2
2х4=8см2
27-8=19см2

Answer 2

Calculation of the Remaining Area of the Plate

To find the area of the remaining part of the rectangular plate, we need to subtract the area of the rectangle that was cut out from the original area of the plate.

The original plate has dimensions of 3 cm by 9 cm, giving it an area of 27 square centimeters.

The rectangle that was cut out has dimensions of 2 cm by 4 cm, giving it an area of 8 square centimeters.

To find the area of the remaining part of the plate, we subtract the area of the cut-out rectangle from the original area of the plate:

Remaining Area = Original Area - Area of Cut-out Rectangle

Remaining Area = 27 cm² - 8 cm²

Remaining Area = 19 cm²

Therefore, the area of the remaining part of the rectangular plate is 19 square centimeters.