Class 9: Maths Chapter 20 solutions. Complete Class 9 Maths Chapter 20 Notes.
Selina Class 9 ICSE Solutions Mathematics : Chapter 20 - Area and Perimeter of Plane Figures
Selina 9th Maths Chapter 20, Class 9 Maths Chapter 20 solutions
Exercise 20(A)
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Since the perimeter of the isosceles triangle is 36cm and base is 16cm.
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Exercise 20(B)
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We need to find the cost of carpeting of 80 cm = 0.8 m wide carpet, if the rate of carpeting is Rs. 25. Per metre.
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In the given figure, we can observe that the non-parallel sides are equal and hence it is an isosceles trapezium.
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Exercise 20(C)
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From the given data, we can calculate the area of the outer circle and then the area of inner circle and hence the width of the shaded portion.
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Selina Class 9 ICSE Solutions Mathematics : Chapter 20 - Area and Perimeter of Plane Figures
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
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