348
Basically there are 3 types of rectangles on a rectangular prism
Width by height
Width by length
Length by height
Find the areas of these 3 rectangles and multiply by 2. (Because there's 6 sides on a rectangular prism)
To find the areas, just plug in what you have
9(width) × 6(height) = 54
9(width) × 8(length) = 72
8(length) × 6(height) = 48
(54 + 72 + 48) = 174
174 × 2 = 348
Step-by-step explanation:
step 1. if r = 2, then its area = (pi)r^2 = (pi)(4) = 4pi
step 2. if r = 3 then its area = (pi)r^2 = (pi)(9) = 9pi
step 3. so A is the area of a circle half the sum of our circles with r = 2 and r = 3.
step 4. A = (4pi + 9pi)/2 = 13pi/2 =6.5(pi).
It's a percent decrease and it decreases by -50%
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