A right angle is a special angle of 90 degrees. When two intersecting rays make an angle of 90 degrees, it is called a right angle. It can be imagined as the inner corner of a square or the corner formed by the intersection of a pin and a desktop. A right angle has many characteristics, such as the two sides of a right angle are perpendicular to each other.
The obtuse angle is greater than 90 degrees but less than 180 degrees. When the angle between two intersecting rays is greater than 90 degrees but less than 180 degrees, it is called obtuse angle. It is conceivable that the door is open, or the arms are open. An obtuse angle is not as special as a right angle, but it is also an angle.
Besides right angles and obtuse angles, there are acute angles and flat angles. The acute angle is less than 90 degrees, and the straight angle is equal to 180 degrees. Acute angles can be imagined as sharp arrows, while right angles can be imagined as straight lines. In the second grade mathematics of primary school, the definition of angle mainly includes right angle and obtuse angle. In further math study, you will come into contact with more kinds of angles.
An acute angle is an angle less than 90 degrees, and its degree is less than a right angle. It can be imagined as an open page, or a posture in which two fingers are clamped. An acute angle has many important properties, such as the two sides of an acute angle are acute angles to each other. A flat angle is an angle equal to 180 degrees, which can be understood as a complete curve. Right angles have special properties, for example, the two sides of a right angle are parallel to each other.
On the types of angles
In further study, you will also come into contact with other types of angles, such as diagonal angle, adjacent angle, complementary angle and complementary angle. The antipodal angle means that the included angle of two rays is complementary to the other group after extending on the same side. Adjacent angles mean that the edges of two angles are the same, and the vertices are on this common edge. Complementary angle means that the sum of the degrees of two angles is 90 degrees. Complementary angle means that the sum of degrees of two angles is 180 degrees.
By studying the definition and nature of angles, we can better understand and use them. The concept of angle is widely used in many mathematical fields, such as geometry and trigonometry. Mastering the definition of angle and related knowledge can not only help solve problems, but also cultivate logical thinking and geometric observation ability. In mathematics learning, diagonal knowledge is a very important part.