Table of Contents
Circles
It is a simple closed curve and is not considered as a polygon.
Parts of Circles
1. Radius – It is a straight line connecting the centre of the circle to the boundary of the same. Radii is the plural of ‘radius’.
2. Diameter –It is a straight line from one side of the circle to the other side passing through the centre.
3. Circumference – It refers to the boundary of the circle.
4. Chord – Any line that connects two points on the boundary of the circle is called Chord. Diameter is the longest chord.
5. Arc – It is the portion of the boundary of the circle.
6. Interior of the Circle – Area inside the boundary of the circle is called the Interior of the Circle.
7. The Exterior of the Circle – Area outside the boundary of the circle is called the Exterior of the Circle.
8. Sector– It is the region in the interior of a circle enclosed by an arc on one side and a pair of radii on the other two sides.
9. Segment – It is the region in the interior of the circle enclosed by an arc and a chord.
Semi-circle
A diameter divides the circle into two semi-circles. Hence the semicircle is the half of the circle, which has the diameter as the part of the boundary of the semicircle.
Construction of a circle if the radius is known
Draw a circle of radius 5 cm.
To draw a circle, we need a compass and a ruler to measure the length.
Step 1: Open the compass and measure the length of 5 cm using a ruler.
Step 2: Mark a point O, which we will use as the centre of the circle.
Step 3: Put the pointer on the point O.
Step 4: Turn the compass to make a complete circle. Remember to do it in one instance.
Discover more from EduGrown School
Subscribe to get the latest posts sent to your email.