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CHAPTERS

1. Chapter 1- Rational and Irrational Numbers

2. Chapter 2- Compound Interest [Without Using Formula

3. Chapter 3- Compound Interest [Using Formula

6. Chapter 6- Simultaneous Equations

7. Chapter 7- Indices [exponents]

9. Chapter 9- Triangles [Congruency in Triangles]

10. Chapter 10- Isosceles Triangle

12. Chapter 12- Mid-Point and Its Converse

13. Chapter 13- Pythagoras Theorem

14. Chapter 14- Rectilinear Figures

15. Chapter 15- Construction of Polygons

19. Chapter 19- Mean and Median

20. Chapter 20- Area and Perimeter of Plane Figures

22. Chapter 22- Trigonometrical Ratios

23. Chapter 23- Trigonometrical Ratios of Standard Angles

24. Chapter 24- Solution Of Right Triangles

25. Chapter 25- Complementary angles

26. Chapter 26- Co-ordinate Geometry

. ABCD and BCFE are parallelograms. If area of triangle EBC=480cm2 , AB=30cm and BC=40cm; Calculate;

(i) Area of parallelogram ABCD;

(ii) Area of parallelogram BCFE;

(iii) Length of altitude from A on CD;

(iv) Area of triangle ECF.

(i) Since △ EBC and parallelogram ABCD are on the same base BC and between the same parallels i.e. BC//AD.

(ii)

Parallelograms on the same base and between the same parallels are equal in area

Area of BCFE = Area of ABCD= 960 cm2

(iii)

Area of triangle ACD=480 = (1/2) x 30 x Altitude

Altitude=32 cm

(iv)

The area of a triangle is half that of a parallelogram on the same base and between the same parallels.

Therefore,

Chapter 1- Rational and Irrational Numbers

Chapter 2- Compound Interest [Without Using Formula

Chapter 3- Compound Interest [Using Formula

Chapter 6- Simultaneous Equations

Chapter 7- Indices [exponents]

Chapter 9- Triangles [Congruency in Triangles]

Chapter 10- Isosceles Triangle

Chapter 12- Mid-Point and Its Converse

Chapter 13- Pythagoras Theorem

Chapter 14- Rectilinear Figures

Chapter 15- Construction of Polygons

Chapter 20- Area and Perimeter of Plane Figures

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

. ABCD and BCFE are parallelograms. If area of triangle EBC=480cm2 , AB=30cm and BC=40cm; Calculate;

(i) Area of parallelogram ABCD;

(ii) Area of parallelogram BCFE;

(iii) Length of altitude from A on CD;

(iv) Area of triangle ECF.

(i) Since △ EBC and parallelogram ABCD are on the same base BC and between the same parallels i.e. BC//AD.

(ii)

Parallelograms on the same base and between the same parallels are equal in area

Area of BCFE = Area of ABCD= 960 cm2

(iii)

Area of triangle ACD=480 = (1/2) x 30 x Altitude

Altitude=32 cm

(iv)

The area of a triangle is half that of a parallelogram on the same base and between the same parallels.

Therefore,

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