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Viva Voce: Mid-point and Perpendicular Bisector of a Line Segment | Lab Manuals for Class 9 PDF Download

Q.1. What is incentre, orthocentre, circumcentre, and centroid in an equilateral triangle?

They all lie on the same point.


Q.2. Name the point of concurrency of three perpendicular bisectors in a triangle.

Circumcentre


Q.3. What do you mean by orthocentre?

The point of concurrency of three altitudes from vertex to opposite sides in a triangle.


Q.4. How many medians can be found in a triangle?

Three median


Q.6. Is it possible to find the mid-point of a line of 7.3 cm by ruler?

No. Because the least count of the ruler is 0.1 cm.


Q.7. How will you differentiate between mid-point and perpendicular bisector of the line segment?

A point which divides the line segment into two equal parts is known as mid-point and if a line drawn at the mid-point which is perpendicular to the given line segment is known as perpendicular bisector.

Viva Voce: Mid-point and Perpendicular Bisector of a Line Segment | Lab Manuals for Class 9In the adjoining figure M is mid-point of line segment AB and PQ is ⊥bisector of AB.


Q.8. What do you mean by perpendicular bisector of the line segment?

A line which divides the another line segment into two equal parts at 90° is known as perpendicular bisector.


Q.9. If a line segment of length 8 cm is divided by a perpendicular bisector, then what will be the length of each part of the line segment?

4 cm


Q.10. What do you mean by median of a triangle?

A line passing through the vertex to mid-point of opposite side is called median of a triangle.


Q.11. What is the point of concurrency of medians in a triangle?

Centroid


Q.12. How will you find centre of a circle or a circumcircle?

By constructing perpendicular bisector of any two chords of the same circle.

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