Question

question:-

an aquarium is in the form of a cuboid whose external measure are 80 cm into 30 cm and 240 cm. the base side face and back face are to be covered with colour paper. find the area of paper needed ?

please answer me

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Answer 1

Answer:

correct question:-

an aquarium is in the form of a cuboid whose external measure are 80cm x 30cm x 40cm. the base, side Face and back face are to be covered with q coloured paper. find the area of the paper needed?

solution:-

• the length of the aquarium = l = 80cm
• wide of the aquarium= b = 30cm
• height of the aquarium = h 40cm

area of the base = l x b = 80 x 30 = 2400cm²

area of the side Face = b x h = 30 x 40 = 1200cm²

area of the back face = l x h = 80 x 40 = 3200cm²

required area :

= area of base + area of back face + ( 2x area of side Face)

= 2400 + 3200 + (2 x 1200)

= 8000cm²

hence the area of the colored paper required is 8000cm²

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question:-

in a building there are 24 cylindrical pillars. the radius of each pillar is 28 cm and height is 4m . find the total cost of painting the curved surface area of the pillars at the rate of 8 per m² .

Answer :-

Radius of cylindrical pillars, r = 28cm

here we are converting cm to m

>> 28cm = 0.28m

so,

• radius = 0.28m
• height = 4m

curved surface area of a cylinder = 2πrh

>> curved surface area of a pillar:

$= 2 \times \frac{22}{7} \times 0.28 \times 4$

>> curved surface area of 24 such pillars:

$= 7.04 \times 24 = 168.96 {m}^{2}$

cost of painting an area of 1m² = $ 8

therefore, cost of painting 1689.6m² =

$= 168.96 \times 8$

$= 1351.68$

hence the total cost of painting the curved surface area of all pillars at the rate of $ 8 per m²

Answer 2

Step-by-step explanation:

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An aquarium is in the form of a cuboid whose external measure are 80cm x 30cm x 40cm. the base, side Face and back face are to be covered with q coloured paper. find the area of the paper needed?

‌$\huge{\underline{\bold{\red{Answer:⤵}}}}$

The length of the aquarium = l = 80cm

Wide of the aquarium= b = 30cm

Height of the aquarium = h 40cm

Area of the base = l x b = 80 x 30 = 2400cm²

Area of the side Face = b x h = 30 x 40 = 1200cm²

Area of the back face = l x h = 80 x 40 = 3200cm²

Required area :

= Area of base + area of back face + ( 2x area of side Face)

= 2400 + 3200 + (2 x 1200)

= 8000cm²

HENCE, the area of the colored paper required is 8000cm²

_________________________________________

Learn more :-

Question:-

In a building there are 24 cylindrical pillars. the radius of each pillar is 28 cm and height is 4m . find the total cost of painting the curved surface area of the pillars at the rate of 8 per m² .

Answer :-

Radius of cylindrical pillars, r = 28cm

Here we are converting cm to m

>> 28cm = 0.28m

So,

Radius = 0.28m

Height = 4m

Curved surface area of a cylinder = 2πrh

>> Curved surface area of a pillar:

$2 \times \frac{22}{7} \times 0.28 \times 4$

>> curved surface area of 24 such pillars:

$7.04 \times 24 = 168.96cm$

Cost of painting an area of 1m² = $ 8

Therefore, cost of painting 1689.6m² =

$168.96 \times 8 =$

$1351.68$

Hence, the total cost of painting the curved surface area of all pillars at the rate of $ 8 per m²