Area = 113.1mm2
d = 2r = 12 mm
216 mm3
6mm = 6/1 mm.
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
8mm
Area = 113.1mm2
6mm
d = 2r = 12 mm
6mm obvious
6mm is a quarter inch.
216 mm3
Area = pi*32 = 28.274 square mm to 3 d.p.
area = 9∏mm (approx. 28.26mm) circumference = 6∏mm (approx. 18.84mm)
Molly fry are usually around 6mm long.
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 of a circle with radius r is pi*r2 where pi is the irrational number approximately equal to 3.14159. You now have all the information required to answer this and other similar questions.