- Quadrilateral
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- Parallelogram
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- Trapezium
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- Rhombus
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- Rectangle
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- Square
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- Mid-point Theorem for Triangles
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- How to solve the angle Problem in quadrilateral
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- Additional Topics

Given below are the **Class 9 Maths** Important Questions for Quadrilaterals

a. Concepts questions

b. Calculation problems

c. Multiple choice questions

d. Long answer questions

e. Fill in the blanks

a. Concepts questions

b. Calculation problems

c. Multiple choice questions

d. Long answer questions

e. Fill in the blanks

Which are these is true or false about parallelogram

- The diagonals of a parallelogram bisect each other
- In a parallelogram, opposite sides and angle are equal.
- A diagonal of a parallelogram divides it into two congruent triangles
- The bisectors of the angles of parallelogram create a rectangle
- Sum of all the internal angles is 360
^{0} - Sum of all the exterior angles is 180
^{0} - Square, rectangle and rhombus are all parallelogram
- Consecutive angles are supplementary

- All the angles of the quadrilateral are obtuse
- Diagonal of the rhombus are equal and perpendicular to each other
- Diagonal of the square are equal and bisect each other at right angle
- Out of four points A,B,C,D in place, there are collinear. A quadrilateral can be formed from these points
- Trapezium, in which the sides that are not parallel are equal in length and angles formed by parallel sides are equal, such trapezium is called isosceles trapezium
- In a parallelogram, diagonal bisect the angles

ABCD is a parallelogram and AP and CQ are perpendiculars from vertices A and C on diagonal BD

Which of the following is true based on given information

a. $AP=CQ$

b. $QD=PB$

c. $DP=QB$

d. $\Delta PAD \cong \Delta QCB$

Solution

The angles of the quadrilateral are in the ratio 2:5:4:1?

Which of the following is true?

a. Largest angle in the quadrilateral is $150^0$

b. Smallest angle is $30^0$

c.The second largest angle in the quadrilateral is $80^0$

d.None of these

Solution

Two adjacent angles in a parallelogram are in the ratio 2:4. Find the values?

a. 80,100

b. 40,140

c. 60,120

d. None of the above

Solution

ABCD is a trapezium with AB =10cm, AD=5 cm, BC=4 cm and DC =7 cm?

Find the area of the ABCD

a. 34 cm

b. 28cm

c. 20 cm

d. None of these

Solution

PQRS is a quadrilateral whose diagonal bisect each other at right angles

a. PQRS is a Square

b. PQRS is a rectangle

c. PQRS is a rhombus

d. None of these

Solution

ABCD is a trapezium where AB||DC. BD is the diagonal and E is the mid point of AD. A line is draw from point E parallel to AB intersecting BC at F. Which of these is true?

a. BF=FC

b. EA=FB

c. CF=DE

d. None of these

Solution

ABCD is a rectangle and P, Q, R and S are mid-points of the sides AB, BC, CD and DA respectively

a. PQRS is a rectangle

b. PQRS is a parallelogram

c. PQRS is a rhombus

d. None of these

Solution

In a parallelogram PQRS, The bisector of angles P and Q meet at point O as shown in below figure. What is the angle O?

a. 80

b. 90

c. 45

d. None of the above

Solution

Rhombus |
Is a quadrilateral with only one pair of parallel sides. |

Rectangles |
Is a quadrilateral whose Two pairs of adjacent sides of a kite are equal, and one pair of opposite angles is equal. Diagonals intersect at right angles. One diagonal is bisected by the other. |

Kite |
Is a quadrilateral whose all the sides are equal and opposite sides are parallel. Opposite angles are equal. |

Right-angled trapezoid |
Is a quadrilateral whose opposite sides of a rectangle are parallel and equal. All angles are 90º. |

Isosceles trapezoid |
A trapezoid having two right angles |

Trapezoid |
Is a trapezoid whose non parallel sides are equal |

Given below are the links of some of the reference books for class 9 Math.

- Mathematics for Class 9 by R D Sharma One of the best book for studying class 9 level mathematics. It has lot of problems to be solved.
- Secondary School Mathematics for Class 9 by R S Aggarwal This is also as good as R.D. Sharma. Either this or the book by R.D. Sharma will do. I find book R.S. Aggarwal little bit more challenging than the one by R.D. Sharma.
- Pearson IIT Foundation Series - Maths - Class 9 Buy this book if you want to challenge yourself further and want to prepare for JEE foundation.
- Pearson IIT Foundation Physics, Chemistry & Maths combo for Class 9 Only buy if you are prepared to study extra topics and want to take your studies a step further. You might need help to understand topics in these books.

You can use above books for extra knowledge and practicing different questions.

Class 9 Maths Class 9 Science

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