This article, discussing properties of a circle and the example.
Properties of Circles
A circle is a line drawn at a fixed
distance from a point. The point is called the centre, and the line that
is drawn a fixed distance from it is called the circumference.
The distance from the centre to the circumference is the radius.
A line joining one part of the
circumference to another part of the circumference is known as a chord. A chord that goes
through the centre of a circle is diameter and has twice the
length of the radius.
Example of Circle (Radius and Diameter)
Example 1
A circle has a radius of 10 cm. What is the longest chord that can be drawn on the circle?
Solution :
The longest chord must go through the centre of the circle. This is the
diameter; the diameter is twice the value of the radius. 2 x 10 = 20 cm.
Answer: 20 cm
Example 2
A line is drawn
from the centre of a circle to its circumference. The diameter of the circle is 16cm. What is the length of the line?
Solution :
The line from the centre of a circle to its circumference is the radius,
and the radius is half the diameter. 16 ÷ 2 = 8cm.
Answer: 3cm
Reviewed by Rinaldi Gultom
on
Februari 19, 2021
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