A square cuts off an angle, and then it becomes a Pentagon. Q: let you add a straight line, how can you divide that figure into two triangles?

A square cuts off an angle, and then it becomes a Pentagon. Q: let you add a straight line, how can you divide that figure into two triangles?

Use a thick enough line to cross the three adjacent sides of the Pentagon. Then the remaining two sides and the thick line form a triangle

Can a square and a pen become a triangle and a quadrilateral?

Yeah
How to describe it!
Let the side length of the square be 4cm
Click the right end of the top side with a ballpoint pen
Point with a ballpoint pen 3cm on the left side
Connect two points to pull OK!... do not know if you understand or not?

What are triangles and squares

Triangles and squares are plane figures

Xiaohua's living room is 5 meters long and 3 meters wide. Now we need to lay tiles on the floor. There are two kinds of tiles, 50cm × 50cm and 30cm × 30cm. Which one is more suitable

50cm × 50cm is suitable. It needs (500 ／ 50) × (300 ／ 50) = 60 pieces

The area is 38.2 square meters. If you use a square tile with a side length of 0.5 meters, is 150 such tiles enough?

The floor area divided by the area of each tile, 600 * 600 is 0.36 square, 800 * 800 is 0.64 square, the number of kickboard is perimeter divided by the length of the brick (600 brick with 600 long board, 800 brick with 800 long board) plus 4 or 5, the wall brick is perimeter multiplied by (floor height - ceiling height) generally 2.5 meters, and then subtract the area of the door, the window does not need to

Given that the length of the diagonal of a square is l, find its perimeter and area

∵ in a square, the length of diagonal line = L, the length of side = the length of diagonal line △ 2 = 22L, the area of square s = the square of side length = 12l2, and the perimeter C = 4 × side length = 4 × 22 = 22

The area of a square is a square centimeter and its circumference is a centimeter

Let the side length be X
xx=a
4x=a
x=4
Diagonal = 4 root 2cm

Given that the diagonal length of a square is l, how to find the perimeter and area of the square?

The diagonal is L
Then the side length is L / √ 2 = l √ 2 / 2
So the perimeter is 4 * l √ 2 / 2 = 2L √ 2
The area is (L √ 2 / 2) &# 178; = L & # 178 / 2

If the perimeter of a square is xcm and the area is X & nbsp; cm2, then its diagonal length is______ cm．

Because the perimeter is xcm, the side length is x4, the area is (x4) 2 = x, the solution is x = 16, according to the Pythagorean theorem, the diagonal length is 42 + 42 = 42cm, so the answer is 42

Given that the perimeter of the rectangle is 20cm and the area is 10cm2, the diagonal length (write the specific process)

Let the rectangle be xcm in length and YCM in width
x+y=10,xy=10,
X + y = 10 square,
x^2+2xy+y^2=100,
If you take xy = 10 generations, you get,
x^2+y^2=80,
So diagonal AC ^ 2 = x ^ 2 + y ^ 2 = 80,
That is, the diagonal is 4 √ 5