Find the surface area of the closed rectangular box shown

6cm, 5cm, 3cm
S.A.= (LW)+2(HL)+2(HW)

I did: (5x6)+2(5x3)+2(6x3)=96 am I correct?

6cm, 5cm, 3cm

This formula for the surface area is for an open box with length L and width W:
S.A.(open)= (LW)+2(HL)+2(HW)

For a closed box, it would be:
S.A.(closed)= 2(LW+HL+HW)

You would do: 2(5x6)+2(5x3)+2(6x3)=?

126. thanks

You're welcome!

To find the surface area of a rectangular box, you need to calculate the area of each face and then add them together.

The formula you used is correct:
Surface Area = (Length x Width) + 2(Height x Length) + 2(Height x Width)

Let's substitute the given values into the formula:

Surface Area = (6cm x 5cm) + 2(3cm x 6cm) + 2(3cm x 5cm)
Surface Area = 30cm² + 36cm² + 30cm²
Surface Area = 96cm²

So, your result of 96cm² is indeed correct.