Knowledge about squares, parallelograms, triangles, trapezoids

Square - the four sides are equal, the four corners are right-angled.

Parallelogram - Two sets of opposite sides are parallel.

Triangle - made up of three sides.

Reminder - There is only one and only one set of opposing edges parallel.

The 2nd floor is good, do you want to add an area formula to lz.

Solution: Rectangles, squares, parallelograms, and trapezoids are all surrounded by four sides, so they are all called quadrilaterals; And then you can judge

From the analysis, it is known that the long infiltration square, square, parallelogram, and trapezoid are all quadrilateral, so the original title is correct;

Therefore, the answer to Li Shouting Cover is: Correct 2,

Triangle: A closed figure composed of three line segments that are not blind on the same straight line on the plane are connected one after the other, which is called a triangle.

Quadrilateral: A closed figure composed of four line segments on a plane that are not on the same straight line are connected one after the other, called a quadrilateral.

Parallelogram: A group of two quadrilaterals with opposite sides parallel to each other is called a parallelogram.

Trapezoid: A quadrilateral shape with one or only one set of opposite sides parallel is called a trapezoid. Luck Hu.

What is the relationship between a square rectangle, a parallelogram, a trapezoidal triangle?

What is the relationship between the square, the rectangular square, the parallelogram and the trapezoidal triangle? [Answer] 1: are all geometric figures 2:

Except for triangles, they are quadrilaterals3: rectangles and retangles are special parallelograms, related extensions: a figure is a shape that can be divided into several empty and lost shapes by outlines in a two-dimensional space, and the figure is a part of the space that does not have spatial malleability, it is a limited and recognizable shape.

Rectangle area = length * width. Square area = side length * side length. Parallelogram area = base * height.

Triangle area = base * height 2. Trapezoidal area = (upper bottom + lower bottom) * height 2. The area formula for a square is:

Area = side length, expressed by letters, is high and is: s=a (s refers to the area of the square, a refers to the length of the side of the square).

The square is a special rectangle, a special rectangle, and the rectangular area slide cavity = rectangular area = length and width.

The letter is: s=ab (s is the area of the rectangle, a is the length of the rectangular shirt, and b is the width of the rectangle).

Summary. Hello, the relationship between parallelograms and rectangles and squares and trapezoids and quadrilaterals is as follows.

Hello, the relationship between parallelograms and rectangles and squares and trapezoids and quadrilaterals is as follows.

1. The above figures are quadrilateral, and they are all closed plane figures enclosed by four line segments that are not on the same straight line and do not cross each other in turn.

2. The rectangle and square are special parallel quadruple quadruple quadrilateral shapes, which not only have the characteristics of two groups of opposite sides of Jianchun being parallel, but also have the characteristics that the inner corners of the four sedan cars are all right angles.

3. The square is a special rectangle because its four sides are of equal length.

4. A parallelogram is a quadrilateral with two sets of opposite sides parallel to each other, while a trapezoid is a quadrilateral with only one set of opposite sides parallel and another set of opposite sides that are not parallel.

5. The area calculation of parallelograms, rectangles, squares, and trapezoids is the multiplication of the bottom edge and the corresponding height.

6. Parallelograms, rectangles, squares, and trapezoids are all convex quadrilaterals, and the sum of the inner and outer angles is 360 degrees.

In addition to convex quadrilaterals such as parallelograms, rectangles, squares, trapezoids, etc., there are also concave quadrilaterals.

The four vertices of a concave quadrilateral are in the same plane, the opposite sides do not intersect and make a straight line on one side, and some of the other sides are on the opposite side. Thank you.

Triangles, parallelograms, trapezoids are all geometric figures of the same plane.

1. Triangle: A closed figure composed of three line segments on a plane that are not on the same straight line are connected end to end is called a triangle.

2. Quadrilateral: The closed figure composed of the four line segments on the plane that are not on the same bright straight line is called a quadrilateral, and the two groups of quadrilaterals with parallel sides are called parallelograms.

3. Trapezoid: There is only a group of quadrilaterals with parallel sides called trapezoids.

Parallelograms and trapezoids are both quadrilaterals. The closed plane figure or three-dimensional figure enclosed by the four imitation middle line segments that are not on the same straight line is called a quadrilateral, which is composed of a convex quadrilateral and a concave quadrilateral. The quadrilateral obtained by sequentially connecting the midpoint on any quadrilateral is called the midpoint quadrilateral, and the midpoint four bima mountain edges are all parallelograms.

Min Liang 1) parallelogram--- rectangular --- square;

2) Trapezoidal. The above is the relationship between the bridges and the widths: the parallelogram includes:

rectangles and squares; Rectangles include squares; The trapezoidal is not the same as the parallelogram, rectangle, and square, and can be understood as a juxtaposition, that is, the trapezoid neither includes the first three, nor does the first three include the trapezoid.