## How do you classify a triangle by its angles?

Triangles can also be classified by their angles. In an acute triangle all three angles are acute (less than 90 degrees). A right triangle contains one right angle and two acute angles. And an obtuse triangle contains one obtuse angle (greater than 90 degrees) and two acute angles.

## What are the 3 ways to classify a triangle by its sides?

We can also classify triangles by their sides.

- scalene triangle-a triangle with no congruent sides.
- isosceles triangle-a triangle with at least 2 congruent sides (i.e. 2 or 3 congruent sides)
- equilateral triangle-a triangle with exactly 3 congruent sides.
- NOTE:

**What are the classification of angles?**

There are four classifications of angles according to their measure: acute, right, obtuse, and straight.

### What are the 3 angles of a triangle?

A triangle contains interior angles and exterior angles. Interior angles are three angles found inside a triangle. Exterior angles are formed when the sides of a triangle are extended to infinity. Therefore, exterior angles are formed outside a triangle between one side of a triangle and the extended side.

### How can you classify the angles?

An acute angle is an angle which measures less than 90 degrees. A right angle measures 90 degrees. An obtuse angle measures more than 90 degrees but less than 180 degrees. A straight angle is an angle measuring 180 degrees while a refrex angle measures more than 180 degrees.

**How do we identify and describe a triangle according to its sides and angles?**

Triangles can be classified by their sides and by their angles. When classifying a triangle by its sides, you should look to see if any of the sides are the same length. If no sides are the same length, then it is a scalene triangle. If two sides are the same length, then it is an isosceles triangle.

#### How do you classify an angle by its angles and sides?

An obtuse triangle is a triangle with one angle that is greater than 90 degrees. A right angle is an angle equal to 90 degrees. A scalene triangle is a triangle in which all three sides are different lengths. A polygon is equilateral if all of its sides are the same length.

#### How do you classify each angle?

Straight angles are exactly 180 degrees. Obtuse angles are between 90 and 180 degrees. Acute angles are between 0 and 90 degrees. Reflex angles are between 180 and 360 degrees.

**How do you classify an angle?**

Angles can be either straight, right, acute or obtuse. An angle is a fraction of a circle where the whole circle is 360°. A straight angle is the same as half the circle and is 180° whereas a right angle is a quarter of a circle and is 90°. You measure the size of an angle with a protractor.