"H" is the most commonly used in mathematics, which represents the height of the figure in geometric figures and the unit of time in calculation problems. One hour is1h. In English, high means high, generally expressed by the initial letter, h= height, S= low area, and V= volume.

"Triangle", "parallelogram" and "trapezoid" all have "height", and the teaching content of "height" belongs to geometry, which is a subject that studies the size, position and shape of figures, and the content of figures is gradually deepened from points, lines and surfaces. The concept and language of geometry are very strict. To learn geometry knowledge, we must first understand related concepts.

"Height" is a line segment, which has different descriptions in different graphs. The height of a triangle is "the perpendicular to the line from any vertex of the triangle to its opposite side, and the line segment between this point and the vertical foot is called the height of the triangle." The height of the parallelogram is "perpendicular to the straight line from any point on one side of the parallelogram to its opposite side". The line segment between this point and the vertical foot is called the height of the parallelogram, and the side where the vertical foot is located is called the bottom of the parallelogram. The height of the trapezoid is perpendicular to the straight line from any point at the bottom of the trapezoid to the other bottom. The line segment between this point and the vertical foot is called the height of the trapezoid, and cannot be made between the two waists. "

Common expressions

1. In chemistry, a chemical symbol representing elemental hydrogen, or 1 hydrogen atom, or a substance composed of atoms.

2. In the name of drug approval, it means chemical drugs.

3. In Hubble's law, h stands for Hubble constant.

4. In quantum physics, it means "Hamiltonian", and lowercase h stands for Planck constant. (its value is about 6.626196×10-34j s)

5. In the international system of units, Henry's inductance unit.

mathematics

In ancient China, mathematics was called arithmetic, also called arithmetic, and finally it was changed to mathematics. Arithmetic in ancient China was one of the six arts (called "number" in the six arts). Mathematics originated from early human production activities. The ancient Babylonians had accumulated some mathematical knowledge, which could be applied to practical problems. Judging from mathematics itself, their mathematical knowledge is only obtained through observation and experience, and there is no comprehensive conclusion and proof, but we should fully affirm their contribution to mathematics.