What is the formula for the circumference of a circle?
Enjoying Flashcards?
Tell us what you think
What is the formula for the circumference of a circle?
There are two formulas for the circumference of a circle,
Where:
circumference
radius
diameter
Define the term radius of a circle.
A radius of a circle is the distance from the centre of a circle to its circumference.
True or False?
Pi () is the ratio between a circle's diameter and its circumference.
True.
Pi () is the ratio between a circle's diameter and its circumference.
What is the relationship between the diameter of a circle and the radius?
The diameter of a circle is twice the length of the radius ().
True or False?
Every point on the circumference of a circle is equidistant from its centre.
True.
Every point on the circumference of a circle is equidistant from its centre.
What is an arc?
An arc is a part of the circumference of a circle.
What is the minor arc ?
The minor arc is the smaller of the two arcs created by two points on the circumference of a circle.
What is the formula for the length of an arc?
The formula for the length of an arc is
Where:
length of the arc
angle of the sector
radius
What is a sector?
A sector is the part of a circle enclosed by two radii and an arc.
What is the major sector?
The major sector is the larger of the two sectors created by two radii in a circle.
What is the formula for the area of a sector?
The formula for the area of a sector is
Where:
area
the angle of the sector
radius
True or False?
The area of a sector is a fraction of the area of the whole circle.
True.
The area of a sector is a fraction of the area of the whole circle.
In the equation , what does represent?
In the equation , the quantity represents the angle of the sector.