What are obtuse angles?


Question by: Isabel Negri | Last updated: December 7, 2021

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The obtuse angle is an angle greater than 90 degrees, which is greater than the right angle, and less than 180 degrees, which is less than a flat angle.

What are right angles, acute angles and obtuse angles?


The acute angle is the angle that counts an amplitude less than 90 °. The obtuse angle, on the other hand, has an amplitude greater than 90 °. The right angle measures 90 ° and its sides are orthogonal.

How many obtuse angles can a round angle contain?

It is also easy to understand that by drawing two perpendicular straight lines to each other, four right angles are formed, which divide the rounded angle into exactly four equal angles.

What angle is it?

An angle is a part of the plane that is obtained by drawing two half-lines having the same origin, which is called the vertex of the angle. In this way the plane is divided into two parts, which are called angles and which are characterized by an amplitude.

How many types of angles are there?

Types of corners

  • Right angle. The right angle measures 90 ° and the sides are orthogonal. …

  • Null angle. The null angle measures zero degrees. …

  • Acute angle. The acute angle is an angle with degrees between 0 ° and 90 °. …

  • Obtuse angle. The obtuse angle is an angle with degrees between 90 ° and 180 °. …

  • Convex angle. …

  • Concave corner.

Find 39 related questions

What is a 45 degree angle called?

The angle of the above figure measures 45 degrees; in fact, placing the protractor over the angle, we see that the segment AB is located between 40 and 50, that is 45 °, that is 45 degrees. … The 90 degree angle is a particular angle and it is called a right angle.

How is a flat corner?

flat angle angle obtained with a half-turn rotation of a ray around its origin. It actually coincides with a half plane, it is a convex and obtuse angle and its amplitude is, in degrees, equal to 180 ° and, in radians, equal to π.

What is the 180 degree angle called?

The flat angle is an angle defined in the following way: given two half-lines with the origin in common, if they form two congruent angles these are called flat angles or planar angles. A flat angle in sexagesimal degrees is an angle of 180 degrees, or π radians.

How can you define an angle?

Definition of angle. First definition of angle: an angle is each of the two parts of the plane identified by two half-lines having a common origin. Let us consider two half-lines a and b having the common origin V (figure 1). The two rays are called sides of the angle.

How do you find the width of an angle?

It’s about the protractor! To use it just make the center of the protractor coincide at the vertex of an angle and the zero of a scale at one of the two sides of the angle. The degree that will result from the crossing of the other side with the protractor will tell us the amplitude of the angle.

What is a 90 degree angle like?

The definitions of degree, radian, and round angle imply that the right angle is a 90 degree angle, which is π / 2 radians or 1/4 of the round angle.

How many degrees is the round angle?

The round angle is the angle between two coincident half-lines that contains the whole plane. By definition of degree and radian, a round angle is an angle of 360 degrees, or 2π radians. Corresponds to twice the flat angle and four times the right angle.

How is the round corner done?

To draw the round angle, two coincident half-lines are represented and a circle is drawn around the vertex; this circle indicates that the rounded angle covers the entire plane. 1) A round angle has an amplitude of 360 °, which correspond to 2π radians.

What is the difference between acute angle and obtuse angle?

In fact, an acute angle is an angle whose amplitude measures less than a right angle, ie 90 °, while an obtuse angle, on the contrary, measures more than a right angle. The acute angle measures less than a right angle. An acute angle is an angle whose width measures less than 90 °, ie it is “smaller” than a right angle.

When is a corner called Esplementare?

Two angles α, β form a pair of exemplary angles if the sum of the amplitudes is equal to the rounded angle, that is, if the sum of their amplitudes is equal to 360 °.

How much do the acute angles of a bracket measure?

We can conclude that the angles of the square are: a right angle of 90 ° and two angles of 45 °, which are half of a right angle.

How to name a corner?

– with the three capital letters indicating in order, a point taken on the first side, the vertex, and a point taken on the second side; – with letters of the Greek alphabet. In the first two cases, the letters must be surmounted: by the symbol ̂ if the corner is convex, and by the symbol ̌, if the corner is concave.

What are angles and how are they measured?

Each angle is associated with an amplitude, the measure correlated to the position of one ray with respect to the other and therefore to the conformation of the portion of the plane constituting the angle: it is expressed in sexagesimal degrees, in six-decimal degrees, in centesimal degrees or in radians, always with real values.

How are angles expressed?

To measure an angle, that is, calculate its amplitude, we can use different units of measurement.

In degrees, the angles measure:

  1. zero angle 0 ° (zero degrees)

  2. 360 ° rotation angle (360 degrees)

  3. flat angle 180 ° (180 degrees)

  4. right angle 90 ° (90 degrees).

What is the 160 degree angle called?

The obtuse angle is an angle greater than 90 degrees, which is greater than the right angle, and less than 180 degrees, which is less than a flat angle.

When do we say that a corner is concave?

A corner is said to be concave when the extension of the sides that define it “falls” inside the corner itself. Simplifying, two half-lines that share the origin always form a concave angle and a convex angle between them “exemplary”, that is, which, if added together, form an angle of 360 °.

What is the measure of the null angle?

In mathematics, in particular in geometry, by null angle we mean the angle that has two coincident half-lines as sides and that does not contain other points besides those of its sides. The null angle measures 0 radians and 0 degrees.

What is the third part of a flat angle?

The third part of a flat angle measures 60 °. Half of a right angle has a width of 45 °. The third part of a right angle has a width of 30 °.

What is a convex angle?

Convex angle

A corner is convex if it does not contain side extensions inside.

What are the additional angles?

In geometry, s angles, two angles whose sum is equal to a flat angle; arches s.


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