NCERT Exemplar Solutions
Class 6 - Mathematics - Unit 2: Geometry - Fill in the Blanks

Question 22

Step-by-step explanation

(a) For ∠AOD

• A right angle is an angle of \(90^\circ\).
• Here, the measure of \(\angle AOD\) is given as \(90^\circ\).
• So, \(\angle AOD = 90^\circ\).
• Therefore, \(\angle AOD\) is a right angle.

(b) For ∠COA

• An acute angle is an angle that is less than \(90^\circ\).
• Here, the measure of \(\angle COA\) is \(30^\circ\).
• We have: \(30^\circ < 90^\circ\).
• So, \(\angle COA\) is an acute angle.

(c) For ∠AOE

• A straight angle is an angle of \(180^\circ\).
• Here, \(\angle AOE\) forms a straight line, so its measure is \(180^\circ\).
• Thus, \(\angle AOE = 180^\circ\).
• Therefore, \(\angle AOE\) is a straight angle.