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The radius of a circle is 2 mm Write down an expression for its area A in scientific notation of the form A a 10-b m2 where a and b are constants?
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What is the width of human hair in word notation when 0.0018 cm is in standard notation?
Eighteen thousandths of a millimeter. 0.0018 cm = 0.018 mm = 18 µm (micrometer) Human hair width actually ranges from 17 to 181 µm. 181 µm is almost .2 mm so you could say "about a fifth of a millimeter for coarse hair"
What is the area of a square with a perimeter of (24a) mm?
The area of square is : 576.0
What is the perimeter of an ellipse if the major axis is 30MM and the minor axis is 12MM?
A simple question with a horrendously complicated answer. Short of carrying out elliptical integrals, the best I can suggest is the Ramanujan approximation according to which: Perimeter = pi*{3(a + b) - sqrt[10ab + 3(a2 + b2)]} where a and b are the semi-major and semi-minor axes. Substituting a = 15 mm and b = 6 mm gives Perimeter = 69.04 mm. A quick and easy, but roughly approximate method is as follows: The ellipse is between a circle of diameter 30 mm and one of 12 mm. Averaging these two gives a diameter of 21 mm. A circle with a 21 mm diameter has a circumference (perimeter) of 65.97 mm.
Multiply 10mm x 6.0m?
Convert 6.0 m to 'mm' , which is 6,000mm Hence 10 mm X 6,000 mm = 60,000 mm^(2) Or in m^(2) 10mm = 10/1000 = 0.01 m Hence 0.01 x 6.0 m = 0.06 m^(2)
