4 cm by 6 cm
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6+4+6+4=20 cm
4R size is 4" × 6"; 10 cm x 15 cm Other photographic print sizes are 3R (3½" × 5"; 9 cm x 13 cm), 4D (4½" × 6"), the 5R (5" × 7"; 13 cm x 18 cm) and 6R (6" × 8"; double the 4R). The print photo size 8R (8" × 10"; 20 cm x 25 cm) is also well known.
(6 cm) x (4 cm) x (2 cm) = 48 cm^3 which is 48 cubic centimeters
6 cm x 4 cm = 24cm2 (length x width = area)
Volume = 1/3*pi*22*6 = 25.133 cubic cm rounded to 3 decimal places