Question

Из жести сделан бак без крышки.Он имеет форму прямоугольного параллелепипеда длиной 90 см,шириной 50 и высотой 70 см.Бак надо покрасить снаружи и изнутри.Какую площадь надо покрасить?

Answer 1

)2*(90+50)=280 см-периметр основания.

2)280*70=19600 см2-площадь боковой поверхности.

3)90*50=4500 см2-площадь основания.

4)(19600+4500)*2=48200 см2-площадь для покраски.

Answer 2

Calculating the Surface Area of the Tank

To calculate the surface area of the tank, we need to consider the surface area of all the sides that need to be painted.

The tank is in the shape of a rectangular prism, so the surface area can be calculated using the formula: Surface Area = 2lw + 2lh + 2wh

Where: - l = length of the tank - w = width of the tank - h = height of the tank

Given: - Length (l) = 90 cm - Width (w) = 50 cm - Height (h) = 70 cm

Calculating the Surface Area

Using the formula, we can calculate the surface area of the tank: Surface Area = 2(90*50) + 2(90*70) + 2(50*70) Surface Area = 9000 + 12600 + 7000 Surface Area = 28600 square centimeters

So, the total surface area that needs to be painted is 28600 square centimeters.