Class 7 Exam > Class 7 Videos > Mathematics (Maths) Class 7 (Old NCERT) > Understanding: Complementary and Supplementary Angles
Understanding: Complementary and Supplementary Angles Video Lecture | Mathematics (Maths) Class 7 (Old NCERT)
FAQs on Understanding: Complementary and Supplementary Angles Video Lecture - Mathematics (Maths) Class 7 (Old NCERT)
| 1. What are complementary angles? |  |
Ans. Complementary angles are two angles that add up to 90 degrees. In other words, when the measures of two angles add up to 90 degrees, they are called complementary angles.
| 2. What are supplementary angles? | |
Ans. Supplementary angles are two angles that add up to 180 degrees. When the measures of two angles add up to 180 degrees, they are called supplementary angles.
| 3. How can we determine if two angles are complementary or supplementary? | |
Ans. To determine if two angles are complementary, we need to check if their sum is equal to 90 degrees. If the sum is 90 degrees, the angles are complementary. On the other hand, to check if two angles are supplementary, we need to see if their sum is equal to 180 degrees. If the sum is 180 degrees, the angles are supplementary.
| 4. Can two angles be both complementary and supplementary? | |
Ans. No, two angles cannot be both complementary and supplementary at the same time. Complementary angles have a sum of 90 degrees, while supplementary angles have a sum of 180 degrees. Therefore, the sum of two complementary angles cannot be equal to 180 degrees, and the sum of two supplementary angles cannot be equal to 90 degrees.
| 5. How can we find the measures of complementary or supplementary angles? | |
Ans. To find the measures of complementary angles, we subtract the given angle from 90 degrees. For example, if one angle is 40 degrees, the complement of that angle would be 90 - 40 = 50 degrees. Similarly, to find the measures of supplementary angles, we subtract the given angle from 180 degrees. For instance, if one angle is 120 degrees, the supplement of that angle would be 180 - 120 = 60 degrees.
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