Areas of Parallelograms and Triangles Class 9 Notes
Chapter 9 Areas of Parallelograms and Triangles
Chapter 9 Mathematics for Grade 9 covers the parallelogram and triangular areas of a class 9 banknote. Here we will discuss some geometric shapes. A detailed explanation of the domains of parallelograms and triangles is given below, along with many theorems and proofs. Read the article below and get the full notes here to learn easily.
These notes help students become familiar with the question format and improve their problem-solving skills. Students can visit Vidyakul to improve their exam preparation by practicing over 1,340 questions from 64 different books. Read on to get the NCERT notes for 9th-grade math chapter 9.
MATHEMATICS NOTES CLASS 9th CH-9
Points to Remember
To help guide students in their exam preparations for NCERT 9th Maths Chapter 9, we have provided some of the important points to remember below:
The sum of the angles of a quadrilateral is 360°.
A quadrilateral is a parallelogram if its opposite sides are equal.
A quadrilateral is a parallelogram if its opposite angles are equal.
The diagonals of a quadrilateral bisect each other if it is a parallelogram.
A quadrilateral is a parallelogram if one pair of opposite sides are equal and parallel.
The quadrilateral formed by joining the mid-points of the sides of a quadrilateral in order is a parallelogram.
A diagonal of a parallelogram divides it into two congruent triangles.
Two opposite angles of a parallelogram are equal.
The diagonals of a parallelogram bisect each other.
In a parallelogram, the bisectors of any two consecutive angles intersect at a right angle.
If a diagonal of a parallelogram bisects one of the angles of the parallelogram, it also bisects the second angle.
Students can get more important points for NCERT Class 9 Maths Chapter 9 on Vidyakul for free!
Topics and Sub-topics
In this chapter you will learn about the various areas of parallelograms and triangles. Based on these theorems, students can solve various problems in this chapter. Now that students have NCERT notes and sample questions for 9th-grade math chapter 9, they should work through all of them and improve the speed and accuracy of their questions.
Refer to the table below to check the important topics included in NCERT Class 9th Math Chapter 9:
The sum of the angles of a quadrilateral is 360°.
A quadrilateral is a parallelogram if its opposite sides are equal.
A quadrilateral is a parallelogram if its opposite angles are equal.
The diagonals of a quadrilateral bisect each other if it is a parallelogram.
A quadrilateral is a parallelogram if one pair of opposite sides are equal and parallel.
The quadrilateral formed by joining the mid-points of the sides of a quadrilateral in order is a parallelogram.
A diagonal of a parallelogram divides it into two congruent triangles.
Two opposite angles of a parallelogram are equal.
The diagonals of a parallelogram bisect each other.
In a parallelogram, the bisectors of any two consecutive angles intersect at a right angle.
If a diagonal of a parallelogram bisects one of the angles of the parallelogram, it also bisects the second angle.
Learn more about the same in Areas of Parallelogram and Triangles Class 9 Notes pdf.
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