Chapter 2 Angles Set 2.1
Question 1.
Match the following:
Measure of the angle | Type of the angle | ||
i. | 180° | a. | Zero angle |
ii. | 240° | b. | Straight angle |
iii. | 360° | c. | Reflex angle |
iv. | 0° | d. | Complete angle |
Solution:
(i – Straight Angle),
(ii – Reflex Angle),
(iii – Complete Angle),
(iv – Zero Angle).
Question 2.
The measures of some angles are given below. Write the type of each angle:
- 75°
- 0°
- 215°
- 360°
- 180°
- 120°
- 148°
- 90°
Solution:
- Acute angle
- Zero angle
- Reflex angle
- Complete angle
- Straight angle
- Obtuse angle
- Obtuse angle
- Right angle
Question 3.
Look at the figures below and write the type of each of the angles:
Solution:
a. Acute angle
b. Right angle
c. Reflex angle
d. Straight angle
e. Zero angle
f. Complete angle
Question 4.
Use a protractor to draw an acute angle, a right angle and an obtuse angle:
Solution:
[Note: Students may draw acute and obtuse angles of measure other than the ones given.]
Intext Questions and Activities
Question 1.
Look at the angles shown in the pictures below. Identify the type of angle and write its name below the picture: (Textbook pg. no. 6)
Solution:
Question 2.
Complete the following table: (Textbook pg. no. 6)
Solution:
Sr. No. | i. | ii. | iii. |
Name of the angle | ∠PYR or ∠RYP | ∠LMN or ∠NML | ∠BOS or ∠SOB |
Vertex of the angle | Y | M | O |
Arms of the angle | YP and YR | ML and MN | OB and OS |