Tick (✓) the correct answer:


Tick (✓) the correct answer:

The area of the cardboard needed to make a box of size 25 cm × 15 cm × 8 cm will be

(a) 390  cm2

(b) 1390 cm2

(c) 2780 cm2

(d) 1000 cm2


(b) $1390 \mathrm{~cm}^{2}$

Surface area $=2(25 \times 15+15 \times 8+25 \times 8)=2(375+120+200)=1390 \mathrm{~cm}^{2}$

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