[Maths Class Notes] on Triangle Theorems Pdf for Exam

Triangle is a plane figure consisting of three sides, and three angles opposite to the sides makes a sum of 180 degrees. It comes in the category of a polygon; polygon is a closed shape plane with line segments. Triangle is the simplest polygon in geometry.

Triangles theorems have significant use in geometry; they prove various properties associated with it. To give students in-depth knowledge about triangle theorems, has uploaded the well-researched explanations on the website. Understanding the theorems is necessary to solve the problems linked with triangles.

 

Properties of a Triangle

The properties of a triangle include the followings:

• It has three sides, angles, and vertices

• The sum of three interior angles are always 180 degree

• The sum of the two sides of this geometrical figure is greater than its third one

• The area of the product of this figure’s height and the base is equal to twice its area.

 

Types of Triangle

There are different types of triangles, and here are the classifications –

According to the Measurement of Angles

• Acute angle, where all interior angles are less than 90 degrees.

• Right angle, where one of the three interior angles of a triangle is 90 degrees.

• Obtuse angle, where one interior angle is greater than 90 degrees.

 

According to the Measurement of Sides

• An equilateral triangle is where all 3 sides are equal.

• An isosceles triangle is where 2 sides are equal.

• A scalene triangle is where no sides are equal.

Since the definition of triangles and their types are now clear, students can now understand the theorems quicker.

 

Theorems of Triangle

Triangle theorems are based on various properties of this geometrical shape, here are some prominent theorems associated with this is that students must know –

1. Pythagoras Theorem

Probably the most popular and widely discussed triangle theorems are Pythagoras’ one.

Pythagoras theorem Class 10 states that ‘in a right-angled triangle, the square of the hypotenuse side is equal to the sum of squares of the other two sides. According to this theorem, the sides of a triangle are named perpendicular, hypotenuse, and base. The hypotenuse is the longest one among these three sides, and it sits opposite to the right angle, i.e. 90 degrees.

 

Moreover, when sides of a Pythagoras theorem triangle have a positive integer value, and then squared and entered into an equation, they are known as a Pythagorean triple.

Formula of Pythagoras theorem: Hypotenuse² = Perpendicular² + Base² 

 

2. Triangle Similarity Theorems

The focus of this theorem is to prove the similarity between two triangles. It specifies conditions under which more than one triangle can be regarded as similar. It considers sides and angles to conclude, and once every condition is met, triangles are considered the same.

 

There are three subtypes of this triangle theorem. These are –

This theorem suggests that if two angles of two triangles are similar, they have the same properties. Since the total value of three angles is 180 degrees, once the value of two angles is known, it is easy to find the third one by subtracting it from 180.

This theorem suggests that when 3 sides of two triangles have the same value or they are proportionate to each other, they are identical or congruent. Moreover, for these two, three sides need to be proportional.

When two sides of two triangles are proportional, and the angle between them have similar values, these two triangles will be similar.

 

3. Basic Proportionality Theorem

The Triangle proportionality theorem suggests that, when a line is drawn matching to one side of a triangle intersecting the other two at particular points, these other two sides are divided in the same ratio.

 

4. Triangle Sum Theorem

Probably the most basic among every triangle theorem, this one proves that all-three angles of this geometric figure constitute a total value of 180 degrees.

 

5. Triangle Inequality Theorem

The Triangle inequality theorem suggests that one side of a triangle must be shorter than the other two. Otherwise, they will not meet and create a triangle. These are some of the notable theorems associated with triangles. Students can learn more about them from the website of – India’s leading e-learning platform.

 

At the website and mobile application of , students will find relevant information and explanation regarding triangle theorems. Furthermore, there are various study materials to aid students in this regard. Also, they can sign up for online classes and doubt clearing sessions to better their preparations for this concept.

Learn Triangle Properties on

Learn about the properties of the triangle explained by the subject matter expert of the . Properties of a triangle help you understand different theorems and find a difference between the various types of them.

On , you get a chance to learn from India’s best maths faculties. Join the online maths tuition class to clear your doubts from them and boost your preparation to score good marks in the exams.

Triangle Theorems Explanation

Theorems are a statement that has definite proof. For example, the Pythagoras theorem proves a square of the hypotenuse is equal to the sum of the squares of the other two sides.

has explained the types and theorems of triangles to help students understand the shape that will help them solve geometrical problems effortlessly. These theorems cover the basics of a triangle that stays with you for a long duration. And benefits you in solving numerical in the higher classes and also in the engineering or architecture stream.