Area of a circle = pi*r2 , where pi = 3.14 and r is the radius of the circle. We have diameter(d) = 12mm so, radius(r) = d/2 = 6mm On putting the values we get Area = 3.14*62 = 3.14*36 = 113mm2
Area = 113.1mm2
An ordinary pencil is one example.
A cent (penny) is circular so the "greatest distance" is simply its diameter. Since 1858, all US cents have had a diameter of 19.05 mm.
As one of the contributors noted, I would like to also state that if these are home works that students are asked to do by their teachers (school work) it defeats the purpose of the homework. Instead of solving the problem I will give hints. Staff who monitor and moderate this site, please give contributors some guidelines please. Find the area of the 20cm diameter circle. Divide it by the area of the 6mm diameter circle. If you get a whole number, that is the answer. If not round it down to the nearest whole number.
8mm
Area of a circle = pi*r2 , where pi = 3.14 and r is the radius of the circle. We have diameter(d) = 12mm so, radius(r) = d/2 = 6mm On putting the values we get Area = 3.14*62 = 3.14*36 = 113mm2
Area = 113.1mm2
If the diameter is 12mm then the radius is 6mm. The area of a circle is pi X r2. Therefore pi X 36 mm2 = about 113.0973 mm2 = area of the circle. Don't forget units!! pi is about 3.1416.
Area = pi*32 = 28.274 square mm to 3 d.p.
A = pi r^(2) r = 6mm pi ~ 3.14 A = 3.14 *(6mm)^(2) A = 3.14 * 36 mm^(2) A = 113.04 mm^(2)
An ordinary pencil is one example.
3.85
A cent (penny) is circular so the "greatest distance" is simply its diameter. Since 1858, all US cents have had a diameter of 19.05 mm.
As one of the contributors noted, I would like to also state that if these are home works that students are asked to do by their teachers (school work) it defeats the purpose of the homework. Instead of solving the problem I will give hints. Staff who monitor and moderate this site, please give contributors some guidelines please. Find the area of the 20cm diameter circle. Divide it by the area of the 6mm diameter circle. If you get a whole number, that is the answer. If not round it down to the nearest whole number.
The volume of a right circular cone with a radius of 4mm and a height of 6mm equals 140.88mm3
they shoot small plastic BB's ranging from .18 to .26 grams and are 6mm in diameter.