Parts of a Circle
This part of the circle is 1/2 the distance from the center to the edge.
What is a radius?
If the Radius is 5cm, what is the Diameter
What is 5 + 5 = 10
If the diameter of a circle is 40cm, what is the area?
What is 3.14 * 40 = 125.6cm
If the radius of a circle is 2cm, what is the circumference?
What is 2 * 2 * 3.14 = 12.56cm
This part of the circle is twice the radius
What is the Diameter?
If the diameter is 48 in, what is the radius?
What is 48 / 2 = 24in
If the diameter of a circle is 16yd, what is the area?
What is 16 * 3.14 = 50.24yd
If the radius of a circle is 6ft, what is the circumference?
What is 6 * 6 * 3.14 = 113.04
This is a segment that touches two ends of the circle and does NOT go through the center
What is a chord?
If the radius is 29in, what is the diameter
What is 29 + 29 = 58in?
If the radius of a circle is 9ft, what is the area?
What is 9 + 9 = 18 * 3.14 = 56.52ft
If the diameter of a circle is 24yd, what is the circumference?
What is 24/2 = 12 * 12 * 3.14 = 452.16yd
A line that touches the outside of the circle only once
What is a tangent?
Circumference Formula
What is C = pi * d?
If the radius of a circle is 13in, what is the area?
What is 13 + 13= 26 * 3.14 = 81.64in
If the diameter of a circle is 36cm, what is the circumference?
What is 36/2 = 18 * 18 * 3.14 = 1017.36cm
A line that touches the circle twice and extends outside it
What is a secant?
Area of a circle Formula
What is A = pi * r2?
If the radius of a circle is 4.5cm, what is the area?
What is 4.5 + 4.5 = 9 * 3.14 = 28.26cm
If the radius of a circle is 8.4cm, what is the circumference?
What is 8.4 * 8.4 * 3.14 = 221.56