Page 145 - New Medley 5 Semester 2

  Right angle: The angle whose measure is exactly 90° is called right
angle.
180° < < 360°
  Obtuse angle: The angle whose measure is greater
than 90° but less than 180° is called obtuse angle.

  Straight angle: The angle whose measure is exactly

180° is called straight angle.

  Reflex angle: The angle whose measure is greater
360°
than 180° but less than 360° is called reflex angle.

  Complete angle: The angle whose measure is 360° is
called complete angle. It is also called full angle.

Let us summarise these angles in a diagram shown below.

90°
Right angle Acute angle Here, 1 full turn – Complete angle

Obtuse angle
1
Straight angle Zero angle turn – Straight angle
180° 2
O 360° 0°
Reflex angle Complete angle 1 turn – Right angle
4

270°
3
Which type of angles has turn?
4

EXERCISE 6.2

A. Measure the following angles using a protractor:

1. 2. 3.

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