# Quadrilaterals Class-9 RS Aggarwal ICSE Maths Goyal

**Quadrilaterals Class-9 RS Aggarwal** ICSE Goyal Brothers Prakashan Mathematics Solutions Goyal Brothers Prakashan Chapter-11. We provide step by step Solutions of Exercise / lesson-11 **Quadrilaterals** for ICSE** Class-9 RS** **Aggarwal** Mathematics .

Our Solutions contain all type Questions with Exe-11 A, Exe-11 B, to develop skill and confidence. Visit official Website **CISCE** for detail information about ICSE Board Class-9 Mathematics.

**Quadrilaterals Class-9 RS Aggarwal** ICSE Mathematics Solutions Goyal Brothers Prakashan Chapter-11

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### Notes On Quadrilaterals

Get the complete notes on quadrilaterals class 9 here. A quadrilateral is a shape which has four sides. In this article, we are going to discuss the different types of quadrilaterals such as square, rectangle, parallelogram properties with proofs.

**•**A plane figure bounded by four sides is called a quadrilateral.

**•**Sum of the angles of a quadrilateral is 360°.

**•**A quadrilateral is a parallelogram, if

**•**A diagonal of a parallelogram divides it into two congruent triangles.

**•**Diagonals of a rhombus bisect each other at right angles, and vice versa.

**•**Diagonals of a square bisect each other at right angles and are equal and vice versa.

**•**Diagonals of a rectangle bisect each other and vice versa.

**•**A line segment joining the mid-points of any two sides of a triangle is parallel to the third side.

**•**A line segment joining the mid-points of any two sides of a triangle is half of the third side.

**•**A line through the mid-point of a side of a triangle, parallel to another side bisects the third side.

**•**The quadrilateral formed by joining the mid-points of the sides of a quadrilateral, is a parallelogram.

**QUADRILATERAL**

**Note:**

**ANGLE SUM PROPERTY OF A QUADRILATERAL**

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### Exercise-11.A, **Quadrilaterals Class-9 RS Aggarwal** ICSE Goyal Brothers Prakashan Mathematics Solutions Goyal Brothers Prakashan

Question 1

In the given Figure ABCD is a parallelogram in ∠A =70 . Calculate ∠ B ∠C and ∠D

Answer-1

**Quadrilaterals Class-9 RS Aggarwal** ICSE Goyal Brothers Prakashan Mathematics Solutions Goyal Brothers Prakashan Exercise-11 B

Question 1

Construct a quadrilaterals PQRS in which PQ =4 cm ∠P =90 QR = 4.3 cm and RS = 3.6 cm and SP =3.2 cm

Answer-1

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