Question

A rectangular prism has a surface area of 400 cm 2. If it is 10 cm long and 10 cm wide, what is its height?

Answer 1

Answer:

it is 5 cm............

Answer 2

Answer:

$area = 2(wl + hl + hw) \\ height = \frac{ \frac{a}{2} - lw}{l + w} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{ \frac{400}{2} - 10 \times 10}{10 + 10} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 5cm$

hope this helps you...