Parts Of Circles

posted on: 17 Apr, 2012 | updated on: 17 Sep, 2012

When we study Geometry, and look at the Circle, we say that the circle is a round figure, which has its boundary at equal distance from a Point called Centre of the circle. If we look at different parts of the circle we use the terms center, radius, arc, diameter, sector and a Chord. We first talk about the radius of a circle.
If we draw a line from center of the circle to the boundary of the circle,(which we call the circumference of the circle), then the length of this line is called the radius of the circle. The radius remains of fixed length, from where ever we draw it. Sector, arc, radii, diameter are parts of circle.

If we join the two radius, which moves in the opposite direction from the center of the circle is called the Diameter of the circle, which is a part of a circle. We observe that two radius join to form a diameter, so we say that the diameter = radius * 2.
Now we talk about another term related to the circle i.e. chord. We say that the chord is the Line Segment, which starts at one point on the circumference of the circle and ends at another end. There can be infinite number of chords that can be drawn inside the circle. Moreover, we observe that the diameter is also the chord, as it ends at the circumference of the circle.

We also find that the diameter is the longest chord of the circle. If any line is drawn outside the circle, which touches the circle at only one point, then it is called the Tangent drawn on the circle. Any line drawn from the centre of the circle to the Tangent is always perpendicular. So, we say that the radius is perpendicular to the circle.

Topics Covered in Parts Of Circles

Diameter

posted on: 29 Jun, 2012 | updated on: 17 Sep, 2012

Circle can be defined as closed round shaped figure. Diameter is one of the terminologies that we use for circle. Diameter of circle is defined as a line that passes from center and touches two points on boundary of circle. Often the word diameter is used to refer line itself. Diameter is twice of radius and is also called as Chord. Chord is defined as any line that joins two p...Read More

Segment of Chords

posted on: 23 Jul, 2012 | updated on: 28 Aug, 2012

As we know that in mathematics Geometry is based on rules, facts, givens, and proofs to find various conclusions.

Now before knowing the meaning of segment of chords we need to learn few terms which are related to Circle like Tangent, chord, radius, circumference, arc etc. So the related terms are

1. Tangent: - any line which is perpendicular to radius a...Read More

Tangent

posted on: 17 Apr, 2012 | updated on: 01 Sep, 2012

A Tangent is a line that touches the curve at one Point. Basically the word tangent came from the Latin word ‘tangere’ that means to touch. The tangent just touches the curve at a point not intersect the curve. The tangent function...Read More

Centre

posted on: 20 Apr, 2012 | updated on: 28 Aug, 2012

Every geometric shape like Circle, triangle, rectangle, square etc has one center and when we rotate any geometric shape around its center, its orientation remains same means length of any straight line from center to its edge remains same, like we have a circle, whose radius is equal to 7 inch, then from center Point to each point of circle, the length of Straight Line is equals...Read More

Chord

posted on: 26 Apr, 2012 | updated on: 28 Aug, 2012

In Geometry, as we know that we study about different shapes. Starting with the basic elements, viz., point, line & plane, some shapes might be rectilinear while some others curved; some might be plane figures & some others are solids. In plane figures some might be 2 dimensional while some others might be 3 dimensional. In spite of all such classifications, we start geometry with...Read More

Sector of a Circle

posted on: 23 May, 2012 | updated on: 28 Aug, 2012

We are already familiar with Circles & some terms associated with them. Let us recall that a Circle is a closed curve formed by joining all the points which are equidistant from a fixed Point, ‘O’ in its Centre. This fixed point is the centre of the circle.
In this session, we will learn about a new term associated with circles, i.e., sector of a circle. To understan...Read More