The total surface area of a cuboid is 236 cm². Its length is 8 cm and height is 6 cm. Find its breadth (in cm).
5
Total surface area of a cuboid = 2(lb + bh + hl).
236 = 2(8b + 6b + 8 × 6)
118 = 14b + 48
14b = 118 - 48 = 70
b = 70 ÷ 14
= 5 cm
Check: 2(8×5 + 5×6 + 6×8) = 2(40 + 30 + 48) = 236 cm².
Hence, 5.
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