Question

Find the sheet required to cover a gift of dimensions 12 cmx 5cm × 15cm, keeping a margin of 5 cm^2 extra​

Answer 1

Answer:

875cm

Step-by-step explanation:

Dimension= 12 cmx 5cm × 15cm= 900cm^3

Extra = 5cm^2= 5cm×5cm= 25cm^2

900-25= 875cm

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Answer 2

Answer:

635 cm^2

Step-by-step explanation:

Total Surface area of the rectangle (gift) = 2(lb+bh+hl)

-- lb = 12×5= 60 cm^2

-- bh= 5×15= 75 cm^2

--hl= 12×15 = 180 cm^2

2(60+75+180) = 630 cm^2

Keeping margin of 5cm^2 extra = 630+5= 635 cm^2