# Types And Angle Sum Property Free Doubts and Solutions

### CBSE - IX - Mathematics - Quadrilaterals

## Why is the angle sum property not applicable to concave quadrilateral?(please explain briefly and if possible with proof and example) Thank you.

**hk.sachdev**9th January 2019, 8:56 PM

### CBSE - IX - Mathematics - Quadrilaterals

## In the given figure, 𝐴𝐵𝐶𝐷 is a quadrilateral and 𝐴𝑂 and 𝐷𝑂 are bisectors of ∠𝐴and ∠𝐷. The value of ′𝑥 ′ is

**gujarsurjeet007**9th February 2018, 8:33 PM

### CBSE - IX - Mathematics - Quadrilaterals

## Solve question no. 22

**vikasg13.hardware**29th December 2017, 11:44 AM

### CBSE - IX - Mathematics - Quadrilaterals

## Please solve question no. 14 with proper explanation

**adityaahuja099**13th November 2017, 7:36 PM

### CBSE - IX - Mathematics - Quadrilaterals

## Please solve question no 14 with proper explanation

**adityaahuja099**10th November 2017, 4:00 PM

### CBSE - IX - Mathematics - Quadrilaterals

## The angles of a quadrilateral are in the ratio 3: 5: 9: 13. Find all the angles of the quadrilateral.

**Topperlearning User**16th August 2017, 2:25 PM

### CBSE - IX - Mathematics - Quadrilaterals

## In the figure, PQRS is a trapezium in which PQ SR. if P = 55o and Q = 70o, find R andS.

**Topperlearning User**16th August 2017, 2:24 PM

### CBSE - IX - Mathematics - Quadrilaterals

## ABCD is a parallelogram. What special name will you give it if the following facts are known? (i) AB = AD (ii)DAB = 90o (iii) AB = AD and DAB = 90o

**Topperlearning User**16th August 2017, 2:23 PM

### CBSE - IX - Mathematics - Quadrilaterals

## Prove that the sum of the interior angles of a quadrilateral is equal to 360o.

**Topperlearning User**16th August 2017, 2:22 PM

### CBSE - IX - Mathematics - Quadrilaterals

## The sides ML and ON of a quadrilateral are produced as shown in the figure. Prove that x + y = a + b

**Topperlearning User**16th August 2017, 2:20 PM

### CBSE - IX - Mathematics - Quadrilaterals

## How does a trapezium differ from a parallelogram?

**Topperlearning User**16th August 2017, 2:19 PM

### CBSE - IX - Mathematics - Quadrilaterals

## In the given figure, LMNQ is a parallelogram in which L = 75o and QMN = 60o. Find NQM and LQM.

**Topperlearning User**16th August 2017, 2:19 PM

### CBSE - IX - Mathematics - Quadrilaterals

## In the given figure, PQRS is a quadrilateral in which PQ is the longest side and RS is the shortest side. Prove that R > P.

**Topperlearning User**16th August 2017, 2:17 PM

### CBSE - IX - Mathematics - Quadrilaterals

## In a quadrilateral ABCD, the line segments bisecting C and D meet at E. Prove that A + B = 2 CED.

**Topperlearning User**16th August 2017, 2:17 PM

### CBSE - IX - Mathematics - Quadrilaterals

## Prove that the diagonals of a parallelogram bisect each other.

**Topperlearning User**16th August 2017, 2:15 PM

### CBSE - IX - Mathematics - Quadrilaterals

## ABCD is a cyclic quadrilateral and O is the centre if the circle. If angleBOD=160°, then find angleBPD

**mkmishra101**2nd March 2016, 6:12 PM

### CBSE - IX - Mathematics - Quadrilaterals

## E and F are respectively the mid points of non parallel sides AD, BC of a trapezium ABCD. Prove that EF || AB

**Paresh**20th November 2015, 7:23 PM

### CBSE - IX - Mathematics - Quadrilaterals

## find the angle of a concave quatrilaterals with angle A =150, angleB=30 and angleC=37 find angle D

**yogita**25th October 2015, 12:07 PM

### CBSE - IX - Mathematics - Quadrilaterals

## The area of rhombus is 72 cm2. If an altitude of the rhombus is half of the corresponding base,determine the measure of each side of the rhombus.

**singhaivk05**11th March 2015, 8:37 PM

### CBSE - IX - Mathematics - Quadrilaterals

## Show that the line segments joining the mid points of opposite sides of a quardilateral bisect each other.

**pkirankumar4321**23rd February 2015, 9:18 PM

### CBSE - IX - Mathematics - Quadrilaterals

## ABCD is a square and on the side DC, an equilateral triangle is constructed. Prove that (i) AE = BE and (ii) DAE = 15o

**Topperlearning User**4th June 2014, 1:23 PM

### CBSE - IX - Mathematics - Quadrilaterals

## The angles of a quadrilateral are in the ratio 3 : 5 : 9 : 13. Find all the angles of quadrilateral.

**Topperlearning User**4th June 2014, 1:23 PM

### CBSE - IX - Mathematics - Quadrilaterals

## ABCD is a parallelogram. If DAB = 60o and DBC = 80o find CDB.

**Topperlearning User**4th June 2014, 1:23 PM

### CBSE - IX - Mathematics - Quadrilaterals

## The angles of a quadrilateral are in the ration 3 : 5 : 9 : 13. Find all the angles of the quadrilateral.

**Topperlearning User**4th June 2014, 1:23 PM

### CBSE - IX - Mathematics - Quadrilaterals

## Prove that the quadrilateral formed (if possible) by the internal angle bisectors of any quadrilateral is cyclic.

**Topperlearning User**4th June 2014, 1:23 PM