Page 99 - Maths Skill - 6

Lines and Angles 97

MIND MAP

Lines and Angles

Perpendicular Lines
Two lines are said to be m
perpendicular if they 90°
intersect at 90°. l

Perpendicular Bisector

Here P
AO = BO 90°
∠POB = 90° A B
O Classification of Angles
So, PQ is the perpendicular If θ = 0 [zero angle] P
bisector of AB Q
If θ = 90° [Right angle] θ Q
O
If θ = 180° [Straight angle]
If θ = 360° [Complete angle]
If 0 < θ < 90° [Acute angle]

If 90° < θ < 180° [Obtuse angle]
If 180° < θ < 360° [Reflex angle]