$(a)\;15 \times3 \times \sqrt{5}\;cm\qquad(b)\;15 \times3 \times \sqrt{7}\;cm\qquad(c)\;\large\frac{15 \times \sqrt{7}}{3}\;cm\qquad(d)\;\large\frac{15 \times 3}{\sqrt{7}}\;cm$

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