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sidmanfu
The stair railings (shaded region) need to be replaced. Determine their total area.
Same area on both sides, so we only need to find one side, and multiply by 2. Also, for the parallelograms, the area is still just length times height. Thus, our area is given by:\[2\left( 3(0.8)^2 +2(1.2(0.8))\right) =2(1.92 +1.92)=2(3.84)=7.68\]