Question

Define- circle, centre, radius, diameter, arc, sector, semicircle

Answer 1

Centre: The given point from which all points on a circle are at the same distance.
here in the figure point O is the centre of circle.

Radius: A radius of a Circle is any of the line segments from it's centre to it's circumference .
here in the figure OB,OQ,OP & AO are radius of circle.

Diameter:It is the longest chord passing through centre.
Here in the figure AB is the diameter.

Arc: Any two points on the circumference of the circle form arc.
here in the figure PQ is an arc.

Sector:It is the area which is bonded by two radius & one arc in the circle.
here POQ is a sector.

Semicircle:A half of the circle. Or area divided by diameter in a circle.

Hope this helps you.....☺

Answer 2

Tangent

A line which touches the circle at one point only is called tangent to the circle at that point.

Diameter

A chord of a circle passing through its centre is called diameter of a circle.

Radius

A line segment joining any point on the circle to its centre is called the radius of the circle.

Arc

Continuous piece of a circle is called an Arc of the circle.

Sector

Sector of a circle the part of the circular region bounded by the ARC and the to radii at the ends of the are together with the ARC and the area is called the sector of a circle.

Step-by-step explanation:

✡more info✡

↪diameter = 2 × radius.

↪there are two types of Arc major arc and minor arc.

↪all radii of a circle are equal.

↪the perimeter of the circle is called its circumference.

↪any part of a circle is called an Arc of a circle.

↪the diameter is the longest chord of the circle.