Definitions
This is the length between the center of the circle and the edge of the circle.
What is a radius?
The circumference is roughly this many times bigger than the radius.
What is about 6 (2π ≈ 6.28)?
This angle is made by 2 radii at the center of the circle.
What is a central angle?
This is how you find the "fraction" of the circle.
What is the central angle divided by 360°?
This is the formula for finding the area of the circle.
What is A = πr2?
This part of the circle lies between the two sides of a central angle that measures less than 180°
What is a minor arc?
This is the equation for circumference.
What is C = 2πr?
This type of arc is greater than 180° and usually contains 3 points in arc notation.
What is a major arc?
The formula for finding arc length is multiplying θ/360 by this.
What is circumference?
The formula for finding sectors is multiplying θ/360 by this.
What is area?
This line segment is the length across the circle
What is a diameter?
If the radius of a circle is 9 m, then the circumference will be this.
What is C = 56.55 m?
A semicircle always has this degree measure.
What is 180°?
The arc length of this circle is 1/5 of the overall circumference of 100 yds.
What is L = 20 yds?
The area of this circle can be found using the radius length of 4 cm.
What is A = 50.27 cm2?
This angle is created when two chords connect at an endpoint on the circle
What is an inscribed angle?
If the diameter of a circle is 25 ft, then the circumference will be this.
What is C = 78.54 ft?
If a minor arc measures at 90°, then the major arc will measure at this.
What is 270°?
Given a circumference of 36 ft and an arc measure of 45° out of 360°, the arc length is this.
What is L = 4.5 ft?
The sector area of this circle is 1/3 of the overall area of 75 in2.
What is S = 25 in2?
This part of the circle is a region bounded by a central angle and its intercepted arc
What is a sector?
If the circumference of a circle is 45 mm, then the radius will be this.
What is r = 7.16 mm?
If an inscribed angle measures at 42°, then the angle's arc will measure at this.
What is 84°?
Given a radius of 6 km and an arc measure of 90° out of 360°, the arc length is this.
What is L = 9.42 km?
Given a radius of 7 m and an arc measure of 30° out of 360°, the sector area is this.
What is S = 12.83 m2?