Length 5cm, width 12cm and height 6cm.

rectangle

Rectangle, a mathematical term, is a parallelogram with right angles called rectangle. It is also defined as a parallelogram with four right angles, and a square is both a rectangle and a diamond.

The essence of a rectangle is: two diagonal lines are equal; Two diagonal lines are equally divided; Two groups of opposite sides are parallel respectively; The two groups of opposite sides are equal respectively; All four corners are right angles; There are two symmetrical axes (there are four squares); Unstable (easily deformed); The square of the diagonal length of a rectangle is the sum of the squares of both sides; The quadrilateral obtained by connecting the midpoints of the sides of the rectangle in turn is a diamond.

Chinese name

rectangle

Foreign name

rectangle

Perimeter formula

C=(a+b)×2= (length+width) ×2

Area formula

S=ab= length × width

subject

Sequence science

type

Mathematical term

brief introduction

Rectangle, a mathematical term, is a parallelogram with right angles called rectangle. It is also defined as a parallelogram whose four corners are right angles. At the same time, the square is a special rectangle and a diamond.

Definition of rectangle length and width:

The first opinion: the long side of a rectangle is called long and the short side is called wide.

The second opinion: the same direction as the horizontal plane is called length, and the opposite is called width. The length and width of a rectangle are relative, and it cannot be absolutely said that "it is longer than the width", but it is customary to say that the long one is long and the short one is wide.