How to calculate the square of a square exhaust pipe? For example, the width is 40 meters, the height is 80 meters, and the length is 25 meters, Don't Scribble if I don't know the formula I want

How to calculate the square of a square exhaust pipe? For example, the width is 40 meters, the height is 80 meters, and the length is 25 meters, Don't Scribble if I don't know the formula I want

0.4*0.8=0.32m^2

A parallelogram vegetable field is 25 meters long at the bottom. According to 17 kg radish per 3 square meters, how many kg radish can be harvested in this field?

Parallelogram area = bottom * height = 25 * 18 = 450 (M2)
450 / 3 * 17 = 2550 (kg)

I have a room, 25 meters in length and 8 meters in width. Now I want to buy floor tiles of 60 cm in length and width
Who can help me with the calculation? I have a room. The room is 25 meters long and 8 meters wide. Now I want to buy floor tiles of 60 cm in length and width. Please help me calculate the total number of bricks needed to be enough!

25=41*0.6+0.4
8=13*0.6+0.2
If we don't consider the problem that the floor tiles can be broken up, we need to have 568 floor tiles of 60cm in length and width
If you can break up a piece into several pieces, you need at least 25 * 8 / 0.6 * 0.6 = 556 pieces