Answer
249 sq. Inches
Steps
The box has got 2+2+1 surface areas to be coated.
The surface areas are
2×(9in×3in)+2×(13in×3in)+1×(13in×9in)
= (2×27)+(2×39)+1×(117) sq inches.
= 54+78+117 = 249 sq inches.
249 sq. Inches
The box has got 2+2+1 surface areas to be coated.
The surface areas are
2×(9in×3in)+2×(13in×3in)+1×(13in×9in)
= (2×27)+(2×39)+1×(117) sq inches.
= 54+78+117 = 249 sq inches.