Q: Area of paper of 21cm by 15cm?

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29.7cm by 21cm

A = 1385cm2

A = 346.36 cm2

A = 1,385.4 cm2

Area of the base of a cylinder = pi*radius2

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29.7cm by 21cm

A = 1385cm2

Approx 29.7cm x 21cm

area of a circle and the question is d=21cm

A = 1,385.4 cm2

A = 346.36 cm2

Yeah, its 21cm x 29.7cm

You did not mention paper size, so I am assuming A4 which is 29.7cm * 21cm Area of 1 sheet = 29.7cm * 21cm = 623.7 cm^2 = 0.06237 m^2 Area of 500 sheets = 0.06237 * 500 = 31.185 m^2 80gsm means 1 sq metre (m^2) of the paper weighs 80g Since the total area of 500 sheets is 31.185 m^2, so 500 sheets weigh = 31.185 * 80g = 2494.8g = 2.4948kg

Area of the base of a cylinder = pi*radius2

A circle with the radius of 21cm would have an area of approximately 1384.74 cm. You would find this by using the equation of pi*(radius^2) = pi*(21^2).

The surface area of a box 15cm x 12cm x 8 cm is 2 times 15cm times 12cm, plus 2 times 15cm times 8 cm, plus 2 time 12cm times 8 cm, or 792cm2. However, this is only the surface area - the actual wrapping paper required would depend on the method of wrapping and how much overlap is desired. Since you would not want to splice the paper, you certainly would need more that 792cm2 but, again, that depends on your wrapping style.

The surface area of a cylinder where height is 80cm and radius is 15cm equals 8953.54cm2