A = 1385cm2
A = 1,385.4 cm2
10.5 x 10.5 x pi = 346.5 sqcm
Radius of circle: 132/2pi = 21cm to the nearest integer
The radius of any circle is the straight line distance from the centre of the circle to any point on the circumference of the circle. The radius being 21 cm makes no difference to the definition of the radius; it just means that the straight line distance from the centre of that circle is 21cm away from any point on the circumference of that circle. The radius of a circle with a radius of 21 cm is 21 cm.
A = 1385cm2
area of a circle and the question is d=21cm
A = 1,385.4 cm2
A circle with the radius of 21cm would have an area of approximately 1384.74 cm. You would find this by using the equation of pi*(radius^2) = pi*(21^2).
The approximate diameter of a circle whose circumference is 21cm is: 6.68cm
10.5 x 10.5 x pi = 346.5 sqcm
Radius of circle: 132/2pi = 21cm to the nearest integer
The radius of any circle is the straight line distance from the centre of the circle to any point on the circumference of the circle. The radius being 21 cm makes no difference to the definition of the radius; it just means that the straight line distance from the centre of that circle is 21cm away from any point on the circumference of that circle. The radius of a circle with a radius of 21 cm is 21 cm.
Area of the base of a cylinder = pi*radius2
21cm each side.
Only if it's 3cm high!
205mm = 20.5cm 21cm > 20.5cm