Find the following area, and ask for it within half an hour

I haven't figured out the one on the upper left yet, so I'll send the back one first.

Upper right: cm=2, md=1 can be obtained from similar triangles, lower left:

Lower right: It can be imagined that the right triangle on the right with a height of 12 hypotenuse and a length of 13 is moved to the top to form a square, and the two right triangles can be congruent from the triangle congruence, right angle + hypotenuse + straight angle.

The area of the original figure is the area of the square, 12*12=144

1.The area of two triangles and the area of just a rectangle.

The area of the overlap is the area outside the two triangles.

s=49+35+13=97

2.△bcm∽△edm

cm:dm=bc:ed=4:2=2:1，cd=10-7=3cm=2，dm=1

s=4+1=5

4.The triangle on the right can be just added to the top of the left to form a 12 12 square.

s=12²=144

I didn't understand the first diagram, the second was 5, and the third was 155

Why is the picture oblique, it's not good-looking.

Construction area: the peripheral horizontal projection area of each floor above the foot of the external wall (column) of the house, including balconies, corridors, basements, outdoor stairs, etc. And it has a permanent building with a cover, a firm structure, and a floor height of more than meters (including meters);

The construction area of the suite: the area composed of three parts: the usable area of the house in the suite, the wall area of the suite, and the construction area of the balcony in the suite.

Usable area: the total usable space area of the house, calculated according to the horizontal projection of the interior wall of the house, that is, the area of carpet or floor tiles.

Therefore, the area of the house, the pure living area, and the floor area of the suite mentioned by the sales lady are three different concepts.

The built-up area of the suite consists of three parts:

1) The usable area of the suite: a, the sum of the area in the bedroom, living room, dining room, corridor, kitchen, bathroom, false floor, toilet, storage room, wall cabinet, etc.; b. Indoor stairs in duplex dwellings shall be included in the usable area according to the sum of the area of the natural floors; c, chimneys, ventilation ducts, and pipe wells that are not included in the structure are included in the usable area.

2) The area of the internal wall of the suite: the dividing wall between the units of the new residential unit, the dividing wall between the unit and the common building space, and the external wall (including the gable) are all common walls. The shared wall shall be included in the area of the wall in the set according to half of the horizontal projection area; The horizontal projection area of the non-common wall is all included in the area of the wall in the suite; The thickness of the interior wall decoration is included in the area of the interior wall.

3) Balcony construction area: a the original design of the closed balcony, according to its peripheral horizontal projection area to calculate the construction area; b, the balcony (bottom balcony) is calculated as half of the horizontal projection area of its bottom plate; c, the concave balcony shall be included in the construction area according to half of its combat area (including the area of the parapet wall); d, half-lifted and semi-concave balcony, the protruding part is calculated as half of the horizontal projection area of its bottom plate, and the recessed part is calculated as half of its combat area.

To sum up, the construction area in the suite = the usable area in the suite + the wall area in the suite + the balcony construction area.

The construction area of the suite consists of three parts: the usable area of the suite, the wall area of the suite, and the balcony construction area. Its calculation formula is: the construction area in the suite, the usable area in the suite + the wall area in the suite + the balcony construction area.

The floor area of the suite refers to the area composed of the usable area of the suite, the wall area of the suite, and the floor area of the balcony in the suite. The construction area in the suite is smaller than the construction area and larger than the usable area in the suite. The formula is:

The construction area of the suite = the usable area of the suite + the area of the wall in the suite + the floor area of the balcony in the suite.

A house is only used for the area of that house.

It is not equivalent to the usable area, including the usable area, the area of the internal partition wall, and half of the partition wall such as the household wall, stairwell, walkway, etc.

The diameter of the circle = the length of the side of the square = the root number 12 = 2 times the root number 3

s circle = r = root number 3) =

What circle? Inscribed, or circumscribed?

A regular hexagon consists of six regular triangles, s shadow = 2s δ = 1 3s regular hexagon.

This is one-third of the area of a regular hexagon.

You can convert this into a quadrilateral, and then this part is exactly one-third of the total, and you can get 72 3 = 24

1. Swept area = square centimeters.

2. The length of the needle tip = 2 cm.

1 (π8²-π5²)x2/3=26π≈

2 8x6-3²π=48- 9π≈

3 It's too sloppy to understand. Please be clear.

Express yourself North. Or say nothing.