![Ex 5.1, 7 - Chapter 5 Class 7 Lines and Angles - Part 2](https://d1avenlh0i1xmr.cloudfront.net/65894f6c-0faa-449e-9dd5-341e5559e433/slide24.jpg)
![Ex 5.1, 7 - Chapter 5 Class 7 Lines and Angles - Part 3](https://d1avenlh0i1xmr.cloudfront.net/366de75c-f384-434e-a35d-9fa7cc65ea39/slide25.jpg)
![Ex 5.1, 7 - Chapter 5 Class 7 Lines and Angles - Part 4](https://d1avenlh0i1xmr.cloudfront.net/b68a175d-fcc3-4674-ba18-dbdf4289e835/slide26.jpg)
![Ex 5.1, 7 - Chapter 5 Class 7 Lines and Angles - Part 5](https://d1avenlh0i1xmr.cloudfront.net/fa38b2bf-c798-44a8-88d4-91d3eb5a3a77/slide27.jpg)
![Ex 5.1, 7 - Chapter 5 Class 7 Lines and Angles - Part 6](https://d1avenlh0i1xmr.cloudfront.net/8941c314-704b-41f1-8e3b-e20c1093bfc6/slide28.jpg)
Supplementary and complementary angles
Last updated at April 16, 2024 by Teachoo
Ex 5.1, 7 Can two angles be supplementary if both of them are: (i) acute? We know that If two angles are supplementary, their sum is 180°. If both angles are acute Angle 1 < 90° Angle 2 < 90° Example: 30 ° & 85° 30° + 85 ° = 115° ≠ 180° Since sum is not 180°, they are not supplementary Let’s take another example. If Angles are 89° & 89° 89° + 89° = 178° ≠ 180° Since sum is not 180°, they are not supplementary Ex 5.1, 7 Can two angles be supplementary if both of them are: (ii) obtuse? We know that If two angles are supplementary, their sum is 180°. If both angles are obtuse Angle 1 > 90° Angle 2 > 90° Example: 100 ° & 120° 100° + 120° = 220° ≠ 180° Since sum is not 180°, they are not supplementary Let’s take another example. If Angles are 91° & 91° 91° + 91° = 182° ≠ 180° Since sum is not 180°, they are not supplementary Ex 5.1, 7 Can two angles be supplementary if both of them are: (iii) right? We know that If two angles are supplementary, their sum is 180°. If both the angles are right angles. Angle 1 = 90° Angle 2 = 90° Here, Angle 1 + Angle 2 = 90° + 90° = 180° Since, sum of both angles is 180° So, they are supplementary.