Page 150 - Math Skill - 4

148 Maths

MIND MAP

Geometry

Elementary Things

1. POINT Polygon Circle
Denoted by a point “It is a two-dimensional
closed figure formed by three
A Circumference
or more line segments.”
2. LINE SEGMENT O r
(i) has two points B d A
(ii) has finite length
P Q Triangle C D

denoted by PQ It has: A Vertex AB = Diameter (d)

3. LINE (i) 3 sides Side OA = OB = radius (r)
(i) has two points (ii) 3 vertices Diameter = 2 × radius
(ii) has infinite length B C AB = 2 × OA
CD = Chord
P Q
AB = Diameter = Longest chord
denoted by PQ

4. RAY Quadrilateral
(i) has two points, one is It has: Vertex B
fixed (i) 4 sides C Angle
(ii) has infinite length (ii) 4 vertices A D It has:
P Q Side (i) 1 vertex B

denoted by PQ (ii) 2 arms Vertex Arm
O A

INTERIOR AND EXTERIOR POINTS OF
AN ANGLE
Square Rectangle

(i) It has four sides (i) It has four sides E B
(ii) AB = BC = CD = DA (ii) AB = CD and BC = AD O C D A
A B Vertex
Side Vertex A Side B Point C, D Interior points
D C D C Point E Exterior points