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(B) The statement is False.The curved surface area of a frustum of a cone is given by the formula $A = \pi l(r_{1} + r_{2})$.In this formula,the slant

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(B) The statement is False.The curved surface area of a frustum of a cone is given by the formula $A = \pi l(r_{1} + r_{2})$.In this formula,the slant height $l$ is defined as $l = \sqrt{h^{2} + (r_{1} - r_{2})^{2}}$,where $h$ is the vertical height,and $r_{1}$ and $r_{2}$ are the radii of the two circular ends.The given expression for the slant height $l = \sqrt{h^{2} + (r_{1} + r_{2})^{2}}$ is incorrect because it uses the sum of the radii instead of the difference of the radii.

Write 'True' or 'False' and justify your answer:
The curved surface area of a frustum of a cone is $\pi l(r_{1}+r_{2})$,where $l = \sqrt{h^{2}+(r_{1}+r_{2})^{2}}$,$r_{1}$ and $r_{2}$ are the radii of the two ends of the frustum,and $h$ is the vertical height.

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Write 'True' or 'False' and justify your answer:The curved surface area of a frustum of a cone is $\pi l(r_{1}+r_{2})$,where $l = \sqrt{h^{2}+(r_{1}+r_{2})^{2}}$,$r_{1}$ and $r_{2}$ are the radii of the two ends of the frustum,and $h$ is the vertical height.