1. Circles
Circumference =
Diameter =
Radius =
Area =
The area of a circle is 36. What is the diameter of the circle?
The radius of a circle is 10. What is the circumference of the circle?
What formula do you use to find the ratio of the arcs, sectors, etc. of a circle?
ANS
ReplyDeleteCircumference = 2 * Pi * R where R = Radius or Pi * D where D = Diameter
Diameter = 2 * R
Radius = D/2
Area = Pi * R2
The area of a circle is 36. What is the diameter of the circle?
36 = Pi * R2 so R = 6 / Square root of Pi so D = (12 * Square root of Pi)/Pi
The radius of a circle is 10. What is the circumference of the circle?
Circumference = 2 * Pi * R so circumference = 20 * Pi
What formula do you use to find the ratio of the arcs, sectors, etc. of a circle?
x/360 = arc length/circumference = area of sector/area where x is the degree measure of the angle