5th Maths : Term 2 Unit 1 : Geometry
Exercise 1.1 (Complementary and Supplementary Angles)
Exercise 1.1
1. Write the measures of the complementary angles of the following angles
i) 45°
Complementary angle of 45° = 90° − 45° = 45°
Complementary angle of 45° = 90° − 45° = 45°
ii) 30°
Complementary angle of 30° = 90° − 30° = 60°
Complementary angle of 30° = 90° − 30° = 60°
iii) 72°
Complementary angle of 72° = 90° − 72° = 18°
Complementary angle of 72° = 90° − 72° = 18°
iv) 88°
Complementary angle of 88° = 90° − 88° = 2°
Complementary angle of 88° = 90° − 88° = 2°
v) 38°
Complementary angle of 38° = 90° − 38° = 52°
Complementary angle of 38° = 90° − 38° = 52°
2. Write the measures of the supplementary angles of the following angles
i) 80°
Supplementary angle of 80° = 180° − 80° = 100°
Supplementary angle of 80° = 180° − 80° = 100°
ii) 95°
Supplementary angle of 95° = 180° − 95° = 85°
Supplementary angle of 95° = 180° − 95° = 85°
iii) 110°
Supplementary angle of 110° = 180° −110° = 70°
Supplementary angle of 110° = 180° −110° = 70°
iv) 135°
Supplementary angle of 135° = 180° − 135° = 45°
Supplementary angle of 135° = 180° − 135° = 45°
v) 150°
Supplementary angle of 150° = 180° −150° = 30°
Supplementary angle of 150° = 180° −150° = 30°
Answer:
Exercise 1.1
1. i) 45° ii) 60 ° iii) 18° iv) 2° v) 52°
2. i) 100° ii) 85 ° iii) 70° iv) 45° v) 30°