Question

3. A matchbox is 4 cm long, 2.5 cm broad and 1.5 cm in height. Its outer sides are to be

covered exactly with craft paper. How much paper will be required to do so ?​

Answer 1

Step-by-step explanation:

Length of the matchbox (l) = 4 cm, breadth (b) = 2.5 cm, height (h) = 1.5 cm ∴ Total surface area of the matchbox = 2 (lb + bh + lh) = 2 (4 × 2.5 + 2.5 × 1.5 + 4 × 1.5) = 2 (10 + 3.75 + 6) = 2 × 19.75 = 39.5 sq. cm. ∴ 39.5 sq. cm

Answer 2

Answer:

Total surface area of cuboid = 2 × ( LB + BH + HL )

-› 2 ×( 10 + 3.75 + 6 )

-› 2 × 19.75

-› 39.5 cm² ans