Circle Basics
What is the term for a straight line passing through the center of a circle, touching both sides?
What is a diameter?
What is the term for the boundary of a circle?
What is the circumference?
What is the formula for finding the circumference of a circle?
What is C = 2πr or C = πd?
The diameter of a circle is ____ times the radius
What is two (2) times?
The radius is always longer than the diameter.
What is False?
What is the distance from the center of the circle to any point on the circumference?
What is a radius?
What do you call the longest straight-line distance across a circle?
What is the diameter?
If the radius of a circle is 5 cm, what is its diameter?
What is 10 cm?
The radius is ____ the length of the diameter.
What is half?
A chord must always pass through the center of the circle
What is False?
The formula for the circumference of a circle is 2πr. What does “r” represent?
What is the radius?
What is the name of a straight line that touches a circle at only one point?
What is a tangent?
If a circle has a diameter of 12 cm, what is its radius?
What is 6 cm?
If the radius of a circle is doubled, how does the area change?
The area becomes four times larger
The area of a circle is given by A = πr².
What is True?
What is the relationship between the diameter and radius of a circle?
The diameter is twice the radius.
What is the term for a part of the circumference of a circle?
What is an arc?
What is the formula for the area of a circle?
What is A = πr²?
If the diameter of a circle is doubled, how does the circumference change?
The circumference also doubles.
The diameter of a circle is equal to twice the radius.
What is True?
The area of a circle is given by which formula?
What is A = πr²?
A region inside a circle enclosed by an arc and two radii is called a ____.
What is a sector?
A circle has a circumference of 31.4 cm. If π ≈ 3.14, what is the diameter?
What is 10 cm?
The ratio of the circumference to the diameter of any circle is always ____.
What is π (pi)?
The formula C = πd can be used to find the area of a circle.
What is False? (It is used for circumference.)