Page 154 - Math Skill - 5

152 Maths

12
Zero Angle
An angle of measure 0° is called a zero angle. The
O 9 3
B A 0 arms OA and OB overlap each other without any
rotation and hence ∠AOB = 0°.
6

Exercise 12.1

1. Which of the following figures represents an angle?

(a) (b) (c)

2. Name the angles in each of the following. Also, name the vertex and the arms in each case:

(a) T (b)
Angle __________ Y Angle __________
Vertex __________ Vertex __________

O Arms __________ S K Arms __________
P

(c) Angle __________ (d) Angle __________
L
Vertex __________ B O Vertex __________

Arms __________ Arms __________

M N A

3. Write the name of all the angles.

(a) A O (b) S
T
R

C
B P Q

4. Measure the following angles using a protractor and fill in the blanks.

(a) C (b) L (c) Y

X Z
B
A M N

∠ ABC = __________ ∠LMN = __________ ∠XYZ = __________