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RD Sharma - Mathematics

17. Understanding Shapes-III (Special Types of Quadrilaterales)

1. Rational Numbers
2. Powers
3. Squares and Square Roots
4. Cubes and Cube Roots
5. Playing with Numbers
6. Algebraic Expressions and Identities
7. Factorization
8. Division of Algebraic Expressions
9. Linear Equation in One Variable
10. Direct and Inverse Variable
11. Time and Work
12. Percentage
13. Profit, Loss, Discount and Value Added Tax (VAT)
Compound Interest
15. Understanding Shapes-I (Polygons)
16. Understanding Shapes-II (Quadrilaterals)
17. Understanding Shapes-III (Special Types of Quadrilaterales)
18. Practical Geometry (Constructions)
19. Visualising Shapes
20. Mensuration-I (Area of a Trapezium and a Polygon)
21. Mensuration-II (Volumes and Surface Areas of a Cuboid and a Cube)
22. Mensuration-III (Surface Area and Volume of a Right Circular Cylinder
23. Data Handling-I (Classification Representation of Data as Histograms)
24. Data Handling-II (Graphical Representation of Data as Pie Charts
25. Data Handling-III (Pictorial Representation of Data as Pie Charts
26. Data Handling-IV (Probability)
27. Introduction to Graphs

Exercise 17.1

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Exercise 17.2

1 2 3 4 5 6 7 8 9 10 11 12 13 14

Exercise 17.3

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Q. 84.9( 8 Votes )

Find the length of the diagonal of a rectangle whose sides are 12 cm and 5 cm.

Class 8th RD Sharma - Mathematics 17. Understanding Shapes-III (Special Types of Quadrilaterales)

Answer :

ABCD is a rectangle

In ΔABC using pythagorous theorem,

AC² = AB² + BC²

AC² = 12² + 5²

AC² = 144 + 25

AC² = 169

AC =

AC = 13cm

Therefore length of diagonal is 13cm.

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PREVIOUSThe sides of a rectangle are in the ratio 4 : 5. Find its sides if the perimeter is 90 cm.NEXTDraw a rectangle whose one side measures 8 cm and the length of each of whose diagonals is 10 cm.

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