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T R I A N G L E S
Page 2


T R I A N G L E S
A closed figure with three sides is called a Triangle.
It has three vertex, sides and Angles.
What is a Triangle?
The term 'triangle' is
derived from 'tri,'
signifying 'three.'
Page 3


T R I A N G L E S
A closed figure with three sides is called a Triangle.
It has three vertex, sides and Angles.
What is a Triangle?
The term 'triangle' is
derived from 'tri,'
signifying 'three.'
Triangles
based on 
Sides
Page 4


T R I A N G L E S
A closed figure with three sides is called a Triangle.
It has three vertex, sides and Angles.
What is a Triangle?
The term 'triangle' is
derived from 'tri,'
signifying 'three.'
Triangles
based on 
Sides
Triangles
based on 
Angles
Page 5


T R I A N G L E S
A closed figure with three sides is called a Triangle.
It has three vertex, sides and Angles.
What is a Triangle?
The term 'triangle' is
derived from 'tri,'
signifying 'three.'
Triangles
based on 
Sides
Triangles
based on 
Angles
Congruence
If the shape and size of two figures are same then these are called Congruent.
 Two circles are
congruent if their
radii are same.
 Two squares are
congruent if their
sides are equal.
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FAQs on PPT: Triangles - Mathematics (Maths) Class 9

1. What are the three types of triangles based on their angles?
Ans. The three types of triangles based on their angles are acute, right, and obtuse triangles.
2. How can you determine if a triangle is isosceles?
Ans. A triangle is isosceles if it has at least two sides of equal length.
3. What is the Pythagorean Theorem and how is it used in triangles?
Ans. The Pythagorean Theorem states that in a right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the other two sides. It is commonly used to find the length of one side of a right triangle when the lengths of the other two sides are known.
4. What is the sum of the interior angles of a triangle?
Ans. The sum of the interior angles of a triangle is always 180 degrees.
5. How can you classify a triangle based on its sides?
Ans. Triangles can be classified based on their sides as equilateral (all sides are equal in length), isosceles (two sides are equal in length), or scalene (no sides are equal in length).
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