Names of Basic Parts
Definition of parts
Arc
Tangent
Diameter
Semicircle
Centre
Sector
Major &
Minor Segments
Chord
Circumference
Radius
Area
100

This is part of the circumference.

What is an arc?

100
Definition of diameter
What is an interval passing the centre, which divides the circle in half?
100
This is a part of a circle that is measured in two ways.
What is an arc?
100
If a chord cut a circle exactly in half, these two parts of a circle would be impossible to differentiate between.
What are major and minor segments?
100
This part of a circle is found by using this formula: D/2
What is the radius?
200

This is the entire outline of the circle.

What is circumference?

200
Definition of sector.
What is an area cut off by two radii?
200
This is the longest chord possible in a circle.
What is the diameter?
200
To find this part of a circle, a right angle and a ruler are used.
What is the center?
200
This part of a circle is equal to 360 degrees.
What is the circumference?
300
This is half of a full circle.
What is a semicircle?
300
Definition of chord.
What is an interval joining two points on the circumference, but not passing through the centre?
300
This is always at a right angle to the radius at the point of contact.
What is a tangent?
300
This part of a circle is made up of a chord and a part of a circle.
What is a major or minor segment?
300
This part of a circle is found using this formula: 2 π R pi
What is the circumference?
400
This is the point inside the circle which is equidistant from all points of the circle
What is the centre?
400
Definition of tangent.
What is a line on the exterior of the circle that touches the circumference at one point?
400
This is a part of a circle whose measure is found by this equation: 2R
What is a diameter?
400
This part of a circle is made up of two radii and an arc.
What is a sector?
400
This is the formula to find the area of a circle.
What is π R² pi
500
This is an interval drawn from the centre of the circle to the circumference.
What is the radius?
500
***DAILY DOUBLE*** The two regions of a circle bounded by a chord and the circle.
What are major and minor segments?
500
To find and draw this circle part, one must use a compass, and constructions like a perpendicular bisector.
What is a tangent?
500
In order to find this part of a circle, things like a ruler, a right angle, and a pencil are used.
What is the center?
500
This part of a circle is any interval joining two parts of the circumference, but does not pass through the center of the circle (not the diameter).
What is a chord?
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