Question

The color of the curved area of a cylindrical bottle with a height of 20cm and radius 7 cm is green while the top and bottom circular parts are red. How much area of this bottle is covered by green color?(π=22/7)

Answer 1

Given:

The color of the curved area of a cylindrical bottle with a height of 20cm and radius 7 cm is green while the top and bottom circular parts are red.

To find:

How much area of this bottle is covered by green colour?

Solution:

The height of the cylindrical bottle, h = 20 cm

The radius of the cylindrical bottle, r = 7 cm

Since the curved area of the cylindrical bottle is coloured green

∴ The area of this bottle covered by green colour is,

= $2 \pi r h$

= $2 \times \frac{22}{7} \times 7 \times 20$

= $2 \times 22 \times 20$

= $\bold{880\:cm^2}$

Thus, 880 m² of the area of this bottle is covered by green colour.

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