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WorksheetsDay 112 Unit 4 Part 3 Circles Vocabulary
Total questions: 15
Worksheet time: 9mins
The set of all points in a plane that are equidistant from a given point, called the center of the circle. If the center is P, then the circle can be denoted by ⭘ P.
Circle
Circumference
Area
Pi
Is the distance around the circle
Circumference
Diameter
Radius
Area
A fraction of the circumference of the circle on which it lies.
Area
Circumference
Arc Length
Perimeter
A segment that has the center as one endpoint and a point on the circle as the other endpoint. A radius is half of the diameter.
Perimeter
Circumference
Area
Radius
A chord that passes through the center of a circle. A diameter is twice the radius d=2r
Radius
Diameter
Circumference
Arc Length
The region bounded by two radii of the circle and their intercepted arc
Sector of a circle
radius
perimeter
Section of a circle
The arc that lies in the interior of an inscribed angle
Major Arc
Intercepted Arc
MInor arc
Perimeter
For all circles, the ratio of the circumference, C, to the diameter, d, is the same. This ratio c/d is denoted by the number π Thus the circumference of a circle is C=πd or C-2 π r
Arc Length Corollary
Circumference of a Circle Theorem 11.8
Area of a Circle Theorem 11.9
Area of a Sector Theorem 11.10
In a circle the ratio of the length of a given arc AB to the circumference is equal to the ratio of the measure of the arc to 360 degrees.
Area of a Sector Theorem 11.10
Area of a Circle Theorem 11.9
Arc Length Corollary
Radian Measure
The ratio of the area, A, of a sector to the area of its circle is equal to the ratio of the measure of the intercepted arc to 360 degrees.
Area of a Sector Theorem 11.10
Radian Measure
Diameter
Area of a Circle Theorem 11.9
The area of a circle is π times the square of the radius A = πr2
Radian Measure
Area of a Sector Theorem 11.10
Area of a Circle Theorem 11.9
Diameter
What is the formula for finding the circumference of a circle?
C = r2
C = rd
A = π·r2
C = π·d
