If radius of upper circular end and lower circular end of a frustum of cone are \( 5 \mathrm{~cm...

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If radius of upper circular end and lower circular end of a frustum of cone are \( 5 \mathrm{~cm} \) and \( 1 \mathrm{~cm} \) respectively and the distance between them is \( 3 \mathrm{~cm} \), then the slant height is
a. \( 10 / 2 \)
b. 5
c. 9
d. \( \sqrt{\frac{100}{4}} \)
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