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°

ii) 30°

Complementary angle of 30° = 90° − 30° = 60°

iii) 72°

Complementary angle of 72° = 90° − 72° = 18°

iv) 88°

Complementary angle of 88° = 90° − 88° = 2°

v) 38°

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°

ii) 95°

Supplementary angle of 95° = 180° − 95° = 85°

iii) 110°

Supplementary angle of 110° = 180° −110° = 70°

iv) 135°

Supplementary angle of 135° = 180° − 135° = 45°

v) 150°

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°