Answer: 2
Step-by-step explanation:
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Answer:
At a point when r = 6 ft
The rate of change of Area with time is given as
(dA/dt) = 36π = 113.1 ft²/min
Step-by-step explanation:
Area of a circle, A = πr²
A = πr²
(dA/dt) = (dA/dr) × (dr/dt)
(dA/dr) = 2πr, (dr/dt) = 3
(dA/dt) = 2πr × 3 = 6πr
At a point when r = 6 ft
(dA/dt) = 6πr = 6π × 6 = 36π = 113.1 ft²/min
Answer:
214.2 units²
Step-by-step explanation:
To find the surface area, we add the area of all the 6 sides.
2(Length x Width) + 2(Length + Width) x height
Surface area
= 2(6.5 x 8) + 2(6.5 + 8) (3.8)
= 104 + 110.2
= 214.2 units²
