A diameter is a section that connects two points that lie on the circumference, that passes through the center of the circle. The diameter is actually twice the radius.
As in the case of the radius, as well as in the case of the diameter, there are an infinite number of diameters on the circumference, and all are identical in length.
Below is an example of a circle with several diameters marked in different colors.
There are only 4 radii in a circle.
Which figure shows the radius of a circle?
Which diagram shows a circle with a point marked in the circle and not on the circle?
M is the center of the circle.
Perhaps \( AB=CD \)
Is it possible that the circumference of a circle is 8 meters and its diameter is 4 meters?
There are only 4 radii in a circle.
A radius is a straight line that connects the center of the circle with a point on the circle itself.
Therefore, the answer is incorrect, as there are infinite radii.
False
Which figure shows the radius of a circle?
It is a straight line connecting the center of the circle to a point located on the circle itself.
Therefore, the diagram that fits the definition is c.
In diagram a, the line does not pass through the center, and in diagram b, it is a diameter.
Which diagram shows a circle with a point marked in the circle and not on the circle?
The interpretation of "in a circle" is inside the circle.
In diagrams a'-d' the point is on the circle, and in diagram c' the point is outside the circle.
M is the center of the circle.
Perhaps
CD is a diameter, since it passes through the center of the circle, meaning it is the longest segment in the circle.
AB does not pass through the center of the circle and is not a diameter, therefore it is necessarily shorter.
Therefore:
No
Is it possible that the circumference of a circle is 8 meters and its diameter is 4 meters?
To calculate, we will use the formula:
Pi is the ratio between the circumference of the circle and the diameter of the circle.
The diameter is equal to 2 radii.
Let's substitute the given data into the formula:
Therefore, this situation is not possible.
Impossible
Is there sufficient data to determine that
\( GH=AB \)
In which of the circles is the center of the circle marked?
M is the center of the circle.
Perhaps \( MF=MC \)
M is the center of the circle.
In the figure we observe 3 diameters?
M is the center of the circle below.
\( AB=10 \)
Can a chord with a length of 15 cm be drawn in the circle?
Is there sufficient data to determine that
No
In which of the circles is the center of the circle marked?
M is the center of the circle.
Perhaps
Yes
M is the center of the circle.
In the figure we observe 3 diameters?
No
M is the center of the circle below.
Can a chord with a length of 15 cm be drawn in the circle?
No
M is the center of the circle shown below.
AB is a chord in the circle and is 8 long.
Which of the options is a reasonable length for circle's diameter?
M is the center of the circle.
Perhaps \( CM+MD=2EM \)
Perhaps \( MF+MD=AB \)
M is the center of the circle.
Is AB the diameter?
M is the center of the circle.
Perhaps \( 0.5DC=EM \)
M is the center of the circle shown below.
AB is a chord in the circle and is 8 long.
Which of the options is a reasonable length for circle's diameter?
M is the center of the circle.
Perhaps
Yes
Perhaps
No
M is the center of the circle.
Is AB the diameter?
No
M is the center of the circle.
Perhaps
Yes