Back to: BASIC TECHNOLOGY JSS2

**Welcome to Class !!**

*We are eager to have you join us !!*

*In today’s Basic Technology class, We will be discussing Circle. We hope you enjoy the class!*

**CIRCLE**

A **circle** is a simple shape, consisting of those points in a plane that are a given distance from a given point – the centre.

**Origin**: The centre of a circle.

**Radius**: The distance from the centre of a circle to any point on it.

**Diameter**: The longest distance from one end of a circle to the other. The diameter = 2 × radius (d = 2r).

**Circumference**: The distance around the circle.

Circumference = *π*×*diameter*.

Circumference = *π*×*d* = 2×*π*×*r*

**Arc**: a curved line that is part of the circumference of a circle.

The arc of a circle is measured in degrees or radians – for example 90° or \displaystyle \frac{\pi}{2}2*π* – a quarter of the circle,

180° or \displaystyle \pi*π* – half of the circle.

The arc is smaller than 360°(or \displaystyle 2\pi2*π*) because that is the whole circle.

**Chord**: a line segment within a circle that touches 2 points on the circle.

**Sector**: is like a slice of pie (a circle wedge).

**Tangent**: a line perpendicular to the radius that touches ONLY one point on the circle.

*We have come to the end of this class. We do hope you enjoyed the class?*

*Should you have any further question, feel free to ask in the comment section below and trust us to respond as soon as possible.*

*We have come to the end of first term. Its been an amazing journey with you and we can’t wait for you to join us in Second Term!!*

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