Question

Find the total surface area of these rectangular boxes when they are (i) lidless and (ii) hollow.

Answer 1

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Answer: 600

Explanation:

I hope this helped!

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- Zack Slocum

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Answer 2

Answer:  450 cm squared if not including the inside surface

900 cm squared if including the inside suface

Step-by-step explanation:

A=2(wl+hl+hw)

A=2(150+90+60)

A=2(300)

A=600

but we have a lidless box so we need to subtract the lid...

600-(wl)=

600-(150)=450

If we are including the inside surface it would double as we would be covering both exposed surfaces of bottom, 2 ends, and 2 sides....

450x2=900