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Encapsulate
math
geOmetry

Basic geometric Shapes Angles triangle

Point: A X types of triangles A
Line, ray and Line
Segment Vertex Arm
Line Angle B C
O Arm Y
Ray By Side By Angle
62° 90° 135° Equilateral Triangle Acute Triangle
has three equal sides
has three angles < 90°
Acute angle Right angle Obtuse angle
Line Segment Isosceles Triangle Right Triangle
240° has two equal sides has one angle = 90°
A B 180° Reflex angle 360° Scalene Triangle Obtuse Triangle
Straight angle Complete angle has no equal sides has one angle > 90°
Intersecting lines, parallel measuring an Angles Circle and its Parts
lines and perpendicular lines
Intersecting
lines 60 70 80 90 90 100 110 60 120 Radius
80
70
50
40 140 130 120 110 100 50 130 140 A
Perpendicular 30 150 40 30 150
Lines 20 160 20 160 Diameter
10 170 10 170
180
0 0 180
B C Chord
Parallel Lines Measuring ∠ABC
drawing an Angles

70
70
140 130 120 110 100 80 90 90 100 70 110 60 120 50 130 140 130 120 110 100 80 90 90 100 70 110 60 120 50 130 C
80
80
60
60
50
50
40 40 140 40 40 140 C
30 150 30 150 30 150 30 150
A B 20 160 20 160 20 160 20 160 40°
10 170 10 170 10 170 10 170
0 180 0 180 0 180 0 180 A B
A B A B
Mental Maths
measure the following angles and write their names in ascending order
according to their measurements. S
A D
P T R

B C Q R U S T E F

Brain Sizzlers
1. If there are 48 spokes in a bicycle wheel, then what angle will formed
between two consecutive spokes?
2. When the hour hand of a clock moves from 12 to 3 and 3 to 9, how many right
angles does the hour hand of the clock move?

144 Mathematics-5