Question

Diagram of circle indicating radius, exterior of circle, major arc, major segment and semicircle of the circle.

Answer 1

✰Radius of a circle:

The fixed point is called the centre of circle and the fixed distance is called radius of the circle. In the given figure O is the centre and the length of OP is the radius of circle.

_______________

✰Exterior of circle:

The region which is outside the circle is called exterior of circle.

_______________

✰Major arc:

The longer area of the circle is called major arc.

_______________

✰Major segment:

The region bounded by the chord and the major arc intercepted by the chord.

_______________

✰Semicircle of the circle:

The half of circle is called semi circle and it's measure is always 180°

Answer 2

$\huge\mathfrak \blue{☞Radius \: of \: a \: Circle☜}$

The constant distance from its centre is called the radius of the circle. In the figure, OA is radius.

$\huge \mathfrak \blue{☞exterior\:of \:circle☜}$

The exterior of a circle is the set of points in the plane whose distance from the center is greater than the radius.

$\huge \mathfrak \blue{☞Diameter☜}$

A chord passing through the centre of a circle is called the diameter of the circle. A circle has an infinite number of diameters. CD is the diameter of the circle as shown in the figure. If d is the diameter of the circle then d = 2r. where r is the radius. or the longest chord is called diameter.

In the figure, AB is the diameter and the arcs CD and DC are semicircles.

$\huge \mathfrak \blue{☞Arc☜}$

A continuous piece of a circle is called an arc. Let A,B,C,D,E,F be the points on the circle. The circle is divided into different pieces. Then, the pieces AB, BC, CD, DE, EF etc. are all arcs of the circle.

What are the Parts of a Circle 6Let P,Q be two points on the circle. These P, Q divide the circle into two parts. Each part is an arc. These arcs are denoted in anti-clockwise direction arc.

$\huge \mathfrak \blue{☞Circumference \: of \: a \: circle☜}$

The perimeter of a circle is called its circumference. The circumference of a circle of radius r is 2πr.

$\huge \mathfrak \blue{☞Semicircle☜}$

The diameter of a circle divides the circle into two equal parts. Each part is called a semi-circle. We can also say that half of a circle is called a semi¬circle. In the figure, AXB and AYB represents two semi-circles.

$\huge \mathfrak \blue{☞Segment☜}$

Let AB be a chord of the circle. Then, AB divides the region enclosed by the circle (i.e., the circular disc) into two parts. Each of the parts is called a segment of the circle. The segment, containing the minor arc is called minor segment and the segment, containing the major arc, is called the major segment and segment of a circle is the region between an arc and chord of the circle.