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  1. Diagonal of a rectangular face ●●○○○ 20 ptsA regular right pentagonal prism has a length (the distance between its two pentagonal bases) of 18.9 cm and a volume of 452.7 cm3^3. Find the diagonal length of one of its rectangular faces, in cm, rounded to the nearest millimetre (one decimal place). Use the area of a regular pentagon ≈1.720477 s2\approx 1.720477\,s^2 for side length ss.