Question

rajiv wishes to make a cube without lid with cardboard. the amount of cardboard available is 245 sq.cm . what should be the lenght of the side chosen in order to make the cardboard box ?

Answer 1

total cardboard available = 245 cm ^2

surface area of cube = 6a^2

245 = 6a^2

245/6 = a^2

40.9 = a^2

answer is root 40.9 cm

Answer 2

The length of the side chosen in order to make the cardboard box is 7 cm

Step-by-step explanation:

We are given that rajiv wishes to make a cube without lid with cardboard.

So, Surface area of Cube without lid = $5a^2$

We are given that  the amount of cardboard available is 245 sq.cm

So, $245 = 5a^2$

$\frac{245}{5}=a^2\\\sqrt{\frac{245}{5}}=a\\7 = a$

Hence the length of the side chosen in order to make the cardboard box is 7 cm

#Learn more :

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