#### Chapters

Chapter 2 - Exponents of Real Numbers

Chapter 3 - Rationalisation

Chapter 4 - Algebraic Identities

Chapter 5 - Factorisation of Algebraic Expressions

Chapter 6 - Factorisation of Polynomials

Chapter 7 - Introduction to Euclid’s Geometry

Chapter 8 - Lines and Angles

Chapter 9 - Triangle and its Angles

Chapter 10 - Congruent Triangles

Chapter 11 - Co-ordinate Geometry

Chapter 12 - Heron’s Formula

Chapter 13 - Linear Equations in Two Variables

Chapter 14 - Quadrilaterals

Chapter 15 - Areas of Parallelograms and Triangles

Chapter 16 - Circles

Chapter 17 - Constructions

Chapter 18 - Surface Areas and Volume of a Cuboid and Cube

Chapter 19 - Surface Areas and Volume of a Circular Cylinder

Chapter 20 - Surface Areas and Volume of A Right Circular Cone

Chapter 21 - Surface Areas and Volume of a Sphere

Chapter 22 - Tabular Representation of Statistical Data

Chapter 23 - Graphical Representation of Statistical Data

Chapter 24 - Measures of Central Tendency

Chapter 25 - Probability

## Chapter 17 - Constructions

#### Page 0

Draw a line segment of length 8.6 cm. Bisect it and measure the length of each part.

Draw a line segment AB of length 5.8 cm. Draw the perpendicular bisector of this line

segment.

Draw a circle with centre at point O and radius 5 cm. Draw its chord AB, draw the

perpendicular bisector of line segment AB. Does it pass through the centre of the circle?

Draw a circle with centre at point O. Draw its two chords AB and CD such that AB is not

parallel to CD. Draw the perpendicular bisectors of AB and CD. At what point do they

intersect?

Draw a line segment of length 10 cm and bisect it. Further bisect one of the equal parts and

measure its length.

Draw a line segment AB and bisect it. Bisect one of the equal parts to obtain a line segment of length `1/2` (AB).

7. Draw a line segment AB and by ruler and compasses1 obtain a line segment of length `3/4`AB.

#### Page 0

Draw an angle and label it as ∠BAC. Construct another angle, equal to ∠BAC.

Draw an obtuse angle, Bisect it. Measure each of the angles so obtained.

Using your protractor, draw an angle of measure 108°. With this angle as given, draw an

angle of 54°.

Using protractor, draw a right angle. Bisect it to get an angle of measure 45°.

Draw a linear pair of angles. Bisect each of the two angles. Verify that the two bisecting rays are perpendicular to each other.

Draw a pair of vertically opposite angles. Bisect each of the two angles. Verify that the bisecting rays are in the same line.

Using ruler and compasses only, draw a right angle.

Using ruler and compasses only, draw an angle of measure 135°.

Using a protractor, draw an angle of measure 72°. With this angle as given, draw angles of measure 36° and 54°.

Construct the following angles at the initial point of a given ray and justify the construction 45°

Construct the following angles at the initial point of a given ray and justify the construction 90°.

Construct the angle of the measurement :

1. 30°

Construct the angle of the measurement:

1 . 75°

Construct the angle of the measurement:

1 . 105°

Construct the angle of the measurement:

1. 135°

Construct the angle of the measurement:

1. 15°

Construct the angle of the measurement:

1. 22 `(1°)/2`

#### Page 0

Construct a ΔABC in which BC = 3.6 cm, AB + AC = 4.8 cm and ∠B = 60°.

Construct a ΔABC in which AB + AC = 5.6 cm, BC = 4.5 cm, AB − AC = 1.5 cm and ∠B = 45°.

Construct a ΔABC in which BC = 3.4 cm, AB − AC = 1.5 cm and ∠B = 45°.

Using ruler and compasses only, construct a ΔABC, given base BC = 7cm, ∠ABC = 60° and AB + AC = 12 cm.

Construct a triangle whose perimeter is 6.4 cm, and angles at the base are 60° and 45° .

Using ruler and compasses only, construct a ΔABC from the following data:

AB + BC + CA = 12 cm, ∠B = 45° and ∠C = 60°.

Construct a right-angled triangle whose perimeter is equal to 10 cm and one acute angle equal to 60°.

Construct a triangle ABC such that BC = 6 cm, AB = 6 cm and median AD = 4 cm.

Construct a right triangle ABC whose base BC is 6 cm and the sum of hypotenuse AC and other side AB is 10 cm.

Construct a triangle XYZ in which ∠Y = 30°, ∠Z = 90° and XY + YZ + ZX = 11.

#### Textbook solutions for Class 9

## R.D. Sharma solutions for Class 9 Mathematics chapter 17 - Constructions

R.D. Sharma solutions for Class 9 Mathematics chapter 17 (Constructions) include all questions with solution and detail explanation from Mathematics for Class 9 by R D Sharma (2018-19 Session). This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has created the CBSE Mathematics for Class 9 by R D Sharma (2018-19 Session) solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Class 9 Mathematics chapter 17 Constructions are Introduction of Constructions, Basic Constructions, Some Constructions of Triangles.

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