Question

20cm long cylindrical pencils of diameter 1cm each are packed Ina cuboidal box in two rows if there are 20 pencils to be arranged in this box then what is the surface area of this box

Answer 1

Hi,

Dimensions of the cyliderical pencil is,

Diameter = d = 1 cm

Length of the pencil = 20 cm

Given 20 pencils are arranged in a cubiodal box

in two rows,

Now dimensions of the cuboidal box is

Lenth = l = each pencil length = 20 cm

breadth = b = 10 × each pencil diameter = 10 × 1cm = 10cm

Height = h = 2 × each pencil diameter = 2 × 1 cm = 2 cm

Total surface area of the box = 2 ( lb + bh + lh )

= 2 ( 20 × 10 + 10 × 2 + 20 × 2 )

= 2 ( 200 + 20 + 40 )

= 2 × 260

= 520 square cm.

I hope this will help you.

****

Answer 2

Answer:

Hi,

Dimensions of the cyliderical pencil is,

Diameter = d = 1 cm

Length of the pencil = 20 cm

Given 20 pencils are arranged in a cubiodal box

in two rows,

Now dimensions of the cuboidal box is

Lenth = l = each pencil length = 20 cm

breadth = b = 10 × each pencil diameter = 10 × 1cm = 10cm

Height = h = 2 × each pencil diameter = 2 × 1 cm = 2 cm

Total surface area of the box = 2 ( lb + bh + lh )

= 2 ( 20 × 10 + 10 × 2 + 20 × 2 )

= 2 ( 200 + 20 + 40 )

= 2 × 260

= 520 square cm.

I hope this will help you.

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