A sector with a radius of 2 cm can't have an arc of 18 cm.
If the radius is 2 cm, then the entire circumference of the
whole circle is a little less than 12.6 cm.
Strange as it may seem, the area of that whole circle is
a little less than 12.6 cm2 .
The area is 12.57 cm2
Area= pi*r2If the diameter of the circle is 2cm, the A= pi cm2If the radius of the circle is 2cm, then: A=3.14159*4=12.567 cm2
r square-12r+12=0
2pi sq cm
The area is 22*pi, or 4pi or approximately 12.56 sq cm.
A cylinder whose radius is 2cm and height is 8cm has a total surface area of approximately 125.66cm2 {ADDED} To explain that further, the formula is pi*r^2 X h where r is the radius and h the height.
The area is 22*pi, or 4pi or approximately 12.56 sq cm.
A cylinder with a radius of 4cm and a height of 2cm has a volume of 100.53cm3
The new dimensions are 4cm and 7cm
radius is half the diameter. so 4cm.
1
you half the diamater to get the radius, then you square the radius. Then you times it by 3.14. Always. example. Diameter=4cm then radius =2cm squared=4cm 4x3.14=12.56