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Viva Voce: Verify that if Two Lines Intersect Each Other | Lab Manuals for Class 9 PDF Download

Q.1. If the two adjacent angles are supplementary, then what does that mean?

It forms linear pair.


Q.2. If the angles are complementary, then what does that mean?

Sum of the two angles is 90°.


Q.3. If two angles are vertically opposite angles, where the measure of one of the angles is 30°, then what is the measure of other angle?

30° because vertically opposite angles are equal.


Q.4. How many points are required to draw an angle?

To draw an angle three points are required.


Q.5. If out of two angles of linear pair one is 60°, then what is the measure of other angle?

In a linear pair, sum of both angles is 180°, so if one angle is 60°, then other angle will 180° – 60° = 120°.


Q.6. What is the measure of the angle made at the centre of the circle?

360°


Q.7. What do you mean by a reflex angle?

An angle which is greater than 180° but less than 360° is called a reflex angle.


Q.8. What is the measure of a straight angle?

180°

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