60cm
30/pi cm
Diameter = 30cm so radius = 15 cm. Then Area = pi*r2 = 706.9 cm2
The bases of a cylinder are circles and both have circumferences Area of the base of cylinder and a circle is pi*radius2 Circumference of a cylinder and a circle is 2*pi*radius or diameter*pi
Multiply each of the diameters by pi (pi = 3.14159265 or 3.14 for rough approximation) to find the circumferences of the circles.
60cm
30/pi cm
d = 9.55 cm
circumference = diameter X pi pi = 3.1416 circumference = 30cm X 3.1416 = 94 cm
14 pi inches = a whisker under 44 inches
The perimeter of a circle
Diameter = 30cm so radius = 15 cm. Then Area = pi*r2 = 706.9 cm2
The bases of a cylinder are circles and both have circumferences Area of the base of cylinder and a circle is pi*radius2 Circumference of a cylinder and a circle is 2*pi*radius or diameter*pi
Multiply each of the diameters by pi (pi = 3.14159265 or 3.14 for rough approximation) to find the circumferences of the circles.
If it's a circle, then it's pi*diameter or 2*pi*radius.If it is an ellipse, the circumference (perimeter) is an infinite series with an approximation based on its eccentricity (which for a circle is zero).(see the related link)
It is the planet's diameter multiplied by pi
Area = π*d2 / 4 d = 30 cm => area = 706.86 sq cm