Question

Length breadth and height of cuboid shape box of medicine is 20 CM 12 cm and 10cm respectively find the surface area of vertical faces and total surface area of this box

Answer 1

$\huge{\text{\underline{Solution:-}}}$

★ Given:-

• The surface area of vertical faces = 640 cm²

• Total surface area of this box = 1120 cm²

$\huge{\text{\underline{Explaination:-}}}$

★ Point to remember:-

Length, breadth and height of a cuboid shape box of medicine are 20cm, 12 cm and 10 cm respectively.

★ Using formula:-

• Surface  area of vertical faces = 2 × ( length × height  + Breadth × Height)

= 2 × ( 20 × 10  + 12 × 10)

= 2 × (200 + 120)

= 2 × 320

$\tt{\boxed{= 640}}$

Therefore,Surface  area of vertical faces = 640 cm²

★ Using formula:-

• Total surface Area = Surface  area of vertical faces + 2 × Length × Breadth

→ Total surface Area = 640 + 2 × 20 × 12

→ Total surface Area = 640 + 480

→ Total surface Area = 1120 cm²

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Answer 2

Answer-

Surface area of vertical faces = 640

Total area of box = 1140cm²

Step by Step Explanation-

Given -

Length breadth and height of Cuboid shape box of medicine is 20cm, 12cm, 10cm

Need to find - The surface area of vertical faces and total surface area of box

So, we know that

surface area of vertical faces = 2( l × H + B × H)

Where , L = length, h = hight, B = Breadth

Now,

putting the value

= 2 ( 20 × 10 + 12 × 10 )

= 2 ( 200 + 12 × 10)

= 2 ( 200 + 120 )

= 2 × 320

= 640

Now, we need to find total surface area

and we know that surface area = surface area of vertical faces + 2 ×( length × breadth )

Now,

= 640 + 2 × 240

= 640 + 480

= 1120 cm²