PLZ i need anwse ASAP
1 answer:
Surface area is the sum of area of all the faces .
In the net diagram, we have 6 faces. So we have to find the area of each face and add them to find the surface area .
And since each face is rectangle in shape, so we will use the formula of area of rectangle, which is
So the required surface area is
And that's the required surface area of the rectangular prism .
You might be interested in
Answer:
cm
Step-by-step explanation:
The volume of the box is:
V = height * length * width
V = x*(66 - 2*x)*(90 - 2*x)
V = (66*x - 2*x^2)*(90 - 2*x)
V = 5940*x - 132*x^2 - 180*x^2 + 4*x^3
V = 4*x^3 - 312*x^2 + 5940*x
where x is the length of the sides of the squares, in cm.
The mathematical problem is :
Maximize: V = 4*x^3 - 312*x^2 + 5940*x
subject to:
x > 0
2*x < 66 <=> x < 33
In the maximum, the first derivative of V, dV/dx, is equal to zero
dV/dx = 12*x^2 - 624*x + 5940
From quadratic formula
But , then is not the correct answer.