The actual dimensions of a modern 2x4 is 1.75 by 3.5 inches.
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about 3/4 of an inch or 2 cm
Perimeter equals two times quantity length plus width, or 2(l+w), so: 2(4x+4x-2)=12 2(8x-2)=12 8x-2=6 8x=8 x=1 Plug 1 in for x Length: 4(1)=4 units Width: 4(1)-2=2 units
Area = length * width width = 4*102 length = 2*103 Area = 4*102*2*103 = 8*105
about 3/4 of an inch or 2 cm
2. Think about it. There are 4 sides. Two for width and two for length. And 2+2=4. Right?!