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Right An angle whose measure is 90° is 11 12 1
angle called a right angle. 10 2
9 3
8 4
7 6 5
90°

At 3 o’clock, a 90° angle
is formed.
Obtuse An angle whose measure is more 11 12 1
angle than 90° and less than 180° is called 10 2
an obtuse angle. 9 8 4 3
150° 7 6 5

At 5 o’clock, a 150° angle
is formed.
Straight An angle measuring 180° is called a 11 12 1
angle straight angle. 10 2
9 3
180° 8 4
7 6 5
At 6 o’clock, a 180° angle
is formed.

Reflex An angle greater than 180° and less 11 12 1
angle than 360° is called a reflex angle. 10 2
210° 9 3
8 4
7 6 5

At 7 o’clock, a 210° angle
is formed.
Complete Angle around a point is 360° and is 11 12 1
angle called a complete angle. 10 2
9 3
8 4
7 6 5
360°
Till 12 noon, the hour
hand completes 1
rotation and moves by
360° angle.

activity
Make different types of angles using pencil/matchsticks. Ask your classmates to identify which types
of angles are formed.
Right Acute Obtuse Obtuse Right

53 Lines and Angles