mathematics form 3

NOTA RINGKAS

1. CHAPTER 1 : LINES AND ANGLES II

 

2. CHAPTER 2 : POLYGONS II

Names of Polygons

Name	Sides	Interior Angle	Exterior Angle
Triangle (or Trigon)	3	60°	120°
Quadrilateral (or Tetragon)	4	90°	90°
Pentagon	5	108°	72°
Hexagon	6	120°	60°
Heptagon (or Septagon)	7	128.571°	51.429°
Octagon	8	135°	45°
Nonagon (or Enneagon)	9	140°	30°
Decagon	10	144°	36°

3. CHAPTER 3 : CIRCLES II

Definitions related to circles: 
Arc:  A continuous piece of a circle is called an arc. In other words, any portion of the circumference of a circle is called an arc. 
Chord: A straight line joining any two points on the circumference of a circle is called a chord. 
Circumference: The perimeter of a circle is called its circumference
Diameter:  Any straight line drawn through the centre and terminating at both ways by the circumference is called a diameter. 
Radius: The constant distance of every point on the circle from its centre is called the radius of the circle. It is half of the diameter.
Sector:  A sector is that part of a circle, which lies between an arc and two radii joining the extremities of the centre. The most important sector is a quadrant, which is one-fourth of the circle. 
Tangent of a circle:  It is a line perpendicular to the radius that touches only one point on the circle.