# What do obtuse angles mean?

Question by: Maristella Conti | Last updated: December 10, 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.

## 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 are the angles and how much do they measure?

FLAT ANGLE, ACUTE ANGLE, OCTUS ANGLE AND OTHERS

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.

## What is an angle that measures less than a right angle called?

The acute angle is an angle with degrees between 0 ° and 90 °. Note. The acute angle is less than a right angle.

## What is a convex angle?

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

## Find 38 related questions

### What are the side extensions?

Formally, the extensions of a segment are the rays originating in the extremes of the segment and the direction given by the straight line on which the segment lies. Obviously, a segment can have at most two extensions, because there are only two extremes from which it can be extended.

### What does it mean to extend the sides?

Extending the sides of a corner means drawing the extension of each of the two rays, as shown in the following image, where the extensions of the sides of the corner are shown with a dashed line.

### What angle is 75 degrees?

An acute angle is less than 90 ° (Ex: 75 °). An angle greater than a right angle but less than a flat angle. An obtuse angle is between 90 ° and 180 ° (Ex: 130 °).

### What angle is 145 degrees?

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 is a right angle?

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. …

### What are the flat corners?

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. plate1 adj.

### How do you calculate the width of an angle?

To calculate the width of an angle you use the protractor, just place it on the figure and make the first segment that delimits the angle coincide with the line that corresponds to 0 degrees. In this way the second segment will show on the protractor the amplitude of the angle.

### How is the measurement of an angle calculated?

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 the figure that has all obtuse angles?

Angles: Opposite angles are congruent (i.e. equal) to each other. The parallelogram has 2 acute angles and 2 obtuse angles.

### 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 a 120 degree angle called?

An angle of 120 degrees is called obtuse and even irregular.

### How many primes for a degree?

– The first is the sixtieth part of the degree. We will denote the former with a superscript (‘). – The second is the sixtieth part of the first, or equivalently the 3600th part of the degree.

### How big is the right triangle?

A right triangle is a triangle in which one of the internal angles is a right angle, i.e. it measures 90 °.

### What is a 15 degree angle called?

The acute angle is an angle with degrees between 0 ° and 90 °. The obtuse angle is an angle with degrees between 90 ° and 180 °. The convex angle is an angle with degrees between 0 and 180 °.

### What is the angle that measures 30 degrees?

The angle of 30 degrees, also known as positive angle, is part of the set of acute angles, i.e. all those that are less than 90 degrees and obviously greater than 0 degrees.

### What is the acute angle?

The acute angle is an angle less than 90 degrees, which is a right angle and different from the null angle. Its value in radians is between 0 and π / 2 (excluding π / 2). The first known definition of acute angle comes from Euclid’s Elements (definition 12) and says: “The minor angle of a right angle is said to be acute.”

### When is a figure called concave and convex?

A geometric figure is convex if, taking any two points A and B inside it, the segment that joins them is contained entirely within the figure. A figure is concave if, taken two of its points A and B, the points are extremes of a segment that is not all contained within the figure.

### What are concave and convex polygons?

A polygon is said to be concave if the extension of one of its sides divides it into two parts, while it is said to be convex if this does not happen for either side.

### What are the marked corners called?

An acute angle is an angle with an amplitude less than 90 °. An obtuse angle is an angle with an amplitude greater than 90 °. A flat angle is an angle with an amplitude equal to 180 °. A round angle is an angle obtained by rotating a ray of 360 ° around its origin.