29.76
A = 28.27cm2
(3cm)2 x pi = 28.274 cm2
Pi x 3cm x 3cm= Area
Area of circle of radius 3cm is 3 x 3 x pi ie 9pi sqcm, approx 28.26cm2
Area of a circle = pi x radius2 The area of a circle with radius 3 cm = pi x 32 = 28.27433388 = 28.3 cm2 (1 decimal place)
Use this formula: A = PI(r)2
Area = pi x (radius^2) so 3.14...(3^2) = 28.274333882308139146163790449516 cm²
It is pi*r^2 = 9*pi = 28.2743, approx.
The perimeter of a circle is its circumference and it is: 2*pi*radius or pi*diameter
The diameter is six cm.
A cylinder with a 7cm radius and 3cm height has a total surface area of about 439.82cm2