**TOPIC 6: GEOMETRY | MATHEMATICS FORM 1**

**TOPIC 6: GEOMETRY | MATHEMATICS FORM 1**

**Points and Lines**

A Circle

Draw a circle

To make a circle: Draw a curve that is “radius” away from a central point.

And so:All points are the same distance from the center.

You

can draw it yourself:Put a pin in a board, put a loop of string around

it, and insert a pencil into the loop. Keep the string stretched and

draw the circle!

can draw it yourself:Put a pin in a board, put a loop of string around

it, and insert a pencil into the loop. Keep the string stretched and

draw the circle!

Different Parts of a Circle

Describe different parts of a circle

The

**radius**of the circle is a straight line drawn from the center to theboundaryline or the circumference. The plural of the word radius is**radii**.The

**diameter**is the line crossing the circle and passing through the center. It is the twice of the length of the radius.The

**circumference**of a circle is theboundaryline or theperimeterof the circle.The

a straight line joining two points on thecircumferencepoints of a

circle. The diameter is a special kind of the chord passing through the

center.

**chord**isa straight line joining two points on thecircumferencepoints of a

circle. The diameter is a special kind of the chord passing through the

center.

A

**semi-circle**is an arc which is half of thecircumference.A

**tangent**is a straight line which touches the circle. It does not cut thecircumference. The point at which it touches, is called the**point of contact**.
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