Selina Class 9 ICSE Solutions Mathematics : Chapter 15- Construction of Polygons

Class 9: Maths Chapter 15 solutions. Complete Class 9 Maths Chapter 15 Notes.

Selina Class 9 ICSE Solutions Mathematics : Chapter 15- Construction of Polygons

Selina 9th Maths Chapter 15, Class 9 Maths Chapter 15 solutions

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Steps:

1. We construct the segment AC = 7cm.
2. With A as a centre and radius 5.4 cm , we draw an arc extending on both sides of AC.
3. With C as centre and same radius as in step 2, we draw an arc extending on both sides of AC to cut the first arc at B and D.
4. Join AB,BC,CD and DA.

ABCD is the required rhombus.

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Steps:

1. Draw a base line AQ.
2. From A take some random distance in compass and draw one are below and above the line. Now without changing the distance in compass draw one are below and above the line. These arcs intersect each other above and below the line.
3. Draw the line passing through these intersecting points, you will get a perpendicular to the line AQ.
4. Take distance of 4 cm in compass and mark an arc on the perpendicular above the line. Draw a line parallel to line AQ passing through through this arc.
5. From point A measure an angle of 60 degree and draw the line which intersect above drawn line at some point label it as D.
6. Using the procedure given in step 2 again draw a perpendicular to line AD.
7. Take distance of 3 cm in compass and mark an arc on the perpendicular above the line. Draw a line parallel to line AD passing through through this arc which intersect the line AQ at some point label it as B and to other line at point C.

ABCD is the required parallelogram.

Solution 38:
To draw the parallelogram follows the steps:

1. First draw a line AB of measure 6cm. Then draw an angle of measure 45⁰ at point A such that ∠DAB = 45⁰ and AD = 5cm.
2. Now draw a line CD parallel to the line AB of measure 6cm. Then join BC to construct the parallelogram as shown below:

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Selina Class 9 ICSE Solutions Mathematics : Chapter 15- Construction of Polygons

Download PDF: Selina Class 9 ICSE Solutions Mathematics : Chapter 15- Construction of Polygons PDF

Chapterwise Selina Publishers ICSE Solutions for Class 9 Mathematics :

• Chapter 1 - Rational and Irrational Numbers
• Chapter 2- Compound Interest (Without using formula)
• Chapter 3 - Compound Interest (Using Formula)
• Chapter 4- Expansions (Including Substitution)
• Chapter 5- Factorisation
• Chapter 6 - Simultaneous (Linear) Equations (Including Problems)
• Chapter 7- Indices (Exponents)
• Chapter 8- Logarithms
• Chapter 9- Triangles [Congruency in Triangles]
• Chapter 10- Isosceles Triangles
• Chapter 11- Inequalities
• Chapter 12- Mid-point and Its Converse [ Including Intercept Theorem]
• Chapter 13- Pythagoras Theorem [Proof and Simple Applications with Converse]
• Chapter 14- Rectilinear Figures [Quadrilaterals: Parallelogram, Rectangle, Rhombus, Square and Trapezium]
• Chapter 15- Construction of Polygons
• Chapter 16- Area Theorems [Proof and Use]
• Chapter 17- Circle
• Chapter 18- Statistics
• Chapter 19- Mean and Median
• Chapter 20 - Area and Perimeter of Plane Figures
• Chapter 21- Solids [Surface Area and Volume of 3-D Solids]
• Chapter 22- Trigonometrical Ratios
• Chapter 23- Trigonometrical Ratios of Standard Angles
• Chapter 24- Solution of Right Triangles
• Chapter 25- Complementary Angles
• Chapter 26- Co-ordinate Geometry
• Chapter 27- Graphical Solution (Solution of Simultaneous Linear Equations, Graphically)
• Chapter 28- Distance Formula

About Selina Publishers ICSE

Selina Publishers has been serving the students since 1976 and is one of the quality ICSE school textbooks publication houses. Mathematics and Science books for classes 6-10 form the core of our business, apart from certain English and Hindi literature as well as a few primary books. All these books are based upon the syllabus published by the Council for the I.C.S.E. Examinations, New Delhi. The textbooks are composed by a panel of subject experts and vetted by teachers practising in ICSE schools all over the country. Continuous efforts are made in complying with the standards and ensuring lucidity and clarity in content, which makes them stand tall in the industry.