Density= Mass/Volume However a cm is a length NOT a volume (volume is cubic cm) so your question as asked can not be answered. However if you meant 21 cubic centimeters, then the density would be 2.71 grams per cc.
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
Feather, Air, Helium, Water Vapor, Smoke, a molecule of just about ANYTHING!
Yes.
It is 882 cubic centimetres.
205mm = 20.5cm 21cm > 20.5cm
13 cm and it is an isosceles triangle 55 - 2*21 = 13
1/3 of 21cm = 1/3*21 = 7 cm
A fifth of 21cm is 1/5 x 21 1/5 of 21 is 21/5, which is equal to 4.2 A fifth of 21cm is 4.2 cm
Density= Mass/Volume However a cm is a length NOT a volume (volume is cubic cm) so your question as asked can not be answered. However if you meant 21 cubic centimeters, then the density would be 2.71 grams per cc.
The approximate diameter of a circle whose circumference is 21cm is: 6.68cm
2200mm
A = 1385cm2
area of a circle and the question is d=21cm
A = 1,385.4 cm2