16 cm2
(64 cm3 or cubed)
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10 ft 8 in * 8 ft 4 in = 88.88.. sq feet = 8.2580 sq metres
If the question refers to 2" x 4" then there are 2 x 4 = 8 sq in. If the question refers to 2' x 4' (i.e. the lengths are in feet) then there are : 2 x 12 x 4 x 12 = 1152 sq in
1 in = 2.54 cm (exactly) ⇒ 4 sq in = 4 x (1 sq in) = 4 x (1 in x 1 in) = 4 x (2.54 cm x 2.54 cm) = 4 x 6.4516 sq cm = 25.8064 sq cm ≈ 25.8 sq cm
6' * 4' = 72" * 48" = 3456 sq inches
There are 144 sq. inches in a sq. foot, so 144 x 20 = 2880 sq. inches