# Why do we say obtuse angles?

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**Question by: Rebecca Colombo** | Last updated: August 5, 2021

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An obtuse angle is in fact the exact opposite of an acute angle. … Even in the case of the angle, therefore, it is the absence of sharpness, that is, specifically, of the characteristic of having an opening of less than ninety degrees, to define, albeit indirectly, what the term obtuse means .

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## Why is the obtuse angle so called?

The obtuse angle has a greater amplitude than the acute one, so shouldn’t the obtuse person logically be more open? … It is, in fact, from the meaning of ‘not sharp, not endowed with an acute point’ and therefore ‘blunt, blunt’ that the figurative meaning of obtuse develops.

## What is the figure that has all obtuse angles?

In a triangle there can be at most one and only one obtuse 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 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.

## Find 16 related questions

### 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 °).

### How do you measure the degree of an angle?

width of the 5 angles in the center corresponds exactly to a rounded angle and will measure 360 °. The sum of the internal angles of a pentagon is 540 ° if the sum of 4 of them is 4 times the 5th angle it means that the 5th angle is 1/5 of the total therefore 540/5 = 108 °.

### How many flat corners do you need to compose a round corner?

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.

### 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 to tell if an angle is acute or obtuse?

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 °

### Which quadrilaterals all have equal and right angles?

The rectangle is a parallelogram whose internal angles are equal and all straight (90 °). Each corner is made up of two perpendicular lines. The rectangle is a cyclic quadrilateral. The square is a rectangle with all sides and angles congruent, that is, equal.

### What are the names of the two rays that delimit an angle and their origin?

The Origin of the two rays is called Vertex. The two rays are called Sides. The Angle has only one dimension called Width. Convex Angle: An angle is said to be convex when it does not contain the extensions of its sides.

### What are the angles of an equilateral triangle like?

A triangle is equilateral if its three sides and three angles are equal. It is therefore clear that the amplitude of each of the angles of an equilateral triangle is 60 °.

### What does a dull person mean?

A man with little insight is said to be “dull”. … In a figurative sense, then, to be obtuse means to be a person without mental acuity, acuity, or insight.

### What does dull person mean?

Not sharp, not penetrating; slow, tardy – dull mind; a man or.

### What is a 120 degree angle called?

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

### What does convex angles mean?

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

### What is an angle that measures less than 90 degrees called?

The acute angle is an angle less than 90 degrees, which is a right angle and different from the null angle.

### How is a flat corner formed?

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.

### How are the rays in the flat corner?

Flat angle is each of the two angles formed by two adjacent half-lines, that is, they lie on the same line, both angles are convex. Often this angle is indicated with the symbol π (pi).

### How can I calculate the degrees?

We divide the primes by 60 to determine how many degrees are in 100 ‘. Rule: if the first ones exceed the figure 59 we carry out the integer division by 60. The quotient is the number that must be added to the degrees, while the remainder is the new value for the first ones.

### How do you measure an angle without a protractor?

How can I measure an angle without a protractor? Until the angle is 180 °: start from the vertex, and with the ruler mark two points equidistant on the two rays. Call them A and B. Then, again with the ruler, trace the segment AB, and along the segment mark a cleat every centimeter.

### How to find the angles of a right triangle knowing the sides?

Pythagorean theorem

In each triangle the sum of two sides is less than a flat angle: BAC

### What angle is 130 degrees?

The obtuse angle can also have different amplitude, but it is always greater than 90 °. An obtuse angle, for example, is an angle of 95 °, 100 °, 130 °. The flat angle always measures 180 °, while the round angle is double the flat angle and measures 360 °.

### 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 °.

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