48cm x 78cm is 3744 square cm or 4.03 square feet.
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1 ft = 30.48 cm (exactly) ⇒ 8 ft x 16 ft = (8 x 30.48) cm x (16 x 30.48) cm = 243.84 cm x 487.68 cm
Multiply 20 x 15 x 78 = 23400 cubic cm = 1428 cubic inches
30.48 cm = 1 ft (exactly)⇒ 120 cm x 120 cm = 120 ÷ 30.48 ft x 120 ÷ 30.48 ft≈ 3.937 ft x 3.937 ft≈ 15.5 square feet
There are 7 ft X 12 in/ft X 2.54 cm/in = 213.36 inches.
1 eighth means 1/8 Thus, 1/8 x 48 = 48/8 = 6 cm. 6 cm = 60 mm