NCERT Solutions for Class 9 Maths Chapter 13 Exercise 13.8 Solutions

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NCERT Solutions for Class 9 Maths Chapter 13 Exercise 13.8 Solutions are based on the volume of a sphere.

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Read More: NCERT Solutions For Class 9 Maths Chapter 13 Surface Areas and Volumes

Exercise Solutions of Class 9 Maths Chapter 13 Surface Areas and Volumes

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CBSE X Related Questions

  • 1.
    Solve the linear equations \(3x + y = 14\) and \(y = 2\) graphically.


      • 2.
        A trader has three different types of oils of volume \(870 \text{ l}\), \(812 \text{ l}\) and \(638 \text{ l}\). Find the least number of containers of equal size required to store all the oil without getting mixed.


          • 3.
            Assertion (A) : \((\sqrt{3} + \sqrt{5})\) is an irrational number.
            Reason (R) : Sum of the any two irrational numbers is always irrational.

              • Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
              • Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
              • Assertion (A) is true, but Reason (R) is false.
              • Assertion (A) is false, but Reason (R) is true.

            • 4.
              If \(PQ\) and \(PR\) are tangents to the circle with centre \(O\) and radius \(4 \text{ cm}\) such that \(\angle QPR = 90^{\circ}\), then the length \(OP\) is

                • \(4 \text{ cm}\)
                • \(4\sqrt{2} \text{ cm}\)
                • \(8 \text{ cm}\)
                • \(2\sqrt{2} \text{ cm}\)

              • 5.
                Prove that: \(\frac{\sec^3 \theta}{\sec^2 \theta - 1} + \frac{\csc^3 \theta}{\csc^2 \theta - 1} = \sec \theta \cdot \csc \theta (\sec \theta + \csc \theta)\)


                  • 6.
                    PQ is tangent to a circle with centre O. If \(OQ = a\), \(OP = a + 2\) and \(PQ = 2b\), then relation between \(a\) and \(b\) is

                      • \(a^2 + (a + 2)^2 = (2b)^2\)
                      • \(b^2 = a + 4\)
                      • \(2a^2 + 1 = b^2\)
                      • \(b^2 = a + 1\)

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