NCERT Solutions for Class 9 Maths Chapter 13 Exercise 13.3 Solutions

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NCERT Solutions for Class 9 Maths Chapter 13 Exercise 13.3 Solutions are based on the concept of Surface area of a right circular cone.

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

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CBSE X Related Questions

  • 1.

    In the adjoining figure, $\triangle CAB$ is a right triangle, right angled at A and $AD \perp BC$. Prove that $\triangle ADB \sim \triangle CDA$. Further, if $BC = 10$ cm and $CD = 2$ cm, find the length of AD.


      • 2.
        Let $p$, $q$ and $r$ be three distinct prime numbers. Check whether $pqr + q$ is a composite number or not. Further, give an example for three distinct primes $p$, $q$, $r$ such that
        (i) $pqr + 1$ is a composite number
        (ii) $pqr + 1$ is a prime number


          • 3.
            If the sum of first n terms of an A.P. is given by \( S_n = \frac{n}{2}(3n+1) \), then the first term of the A.P. is

              • 2
              • \( \frac{3}{2} \)
              • 4
              • \( \frac{5}{2} \)

            • 4.
              In a trapezium \(ABCD\), \(AB \parallel DC\) and its diagonals intersect at \(O\). Prove that \[ \frac{OA}{OC} = \frac{OB}{OD} \]


                • 5.
                  Using prime factorisation, find the HCF of 144, 180 and 192.


                    • 6.
                      The sum of a number and its reciprocal is \(\frac{13}{6}\). Find the number.

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