1. How many end points does a line segment have?
- A0
- B1
- C2
- DInfinitely many
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Answer: C) 2
A line segment is a part of a line bounded by two distinct end points, so it has exactly 2 end points.
Class 9 Geometrical Terms and Definitions — practice questions with answers
Geometry — Foundations · 5 sample questions from the school syllabus. Try each one, then open the answer and the worked solution.
2. Three or more points lying on the same straight line are called:
- AConcurrent points
- BCollinear points
- CCoplanar points
- DNon-collinear points
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Answer: B) Collinear points
Points that lie on one common straight line are collinear.
3. A triangle in which all three sides are of different lengths is called a:
- AEquilateral triangle
- BIsosceles triangle
- CScalene triangle
- DRight triangle
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Answer: C) Scalene triangle
A scalene triangle has all three sides (and all three angles) different.
4. On a straight line, three angles AOB, BOC and COD are placed side by side at point O, together forming a straight angle.
If angle AOB = 55 deg and angle COD = 65 deg, find angle BOC.
If angle AOB = 55 deg and angle COD = 65 deg, find angle BOC.
- A120
- B60
- C54
- D66
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Answer: B) 60
The three angles together make a straight angle (180 deg): 55 + BOC + 65 = 180, so BOC = 180 - 120 = 60 deg.
5. Consider angles A and B where A is the complement of B, and A is also 30 deg larger than B.
Set up the two conditions: A + B = 90 and A = B + 30.
Find the measure of angle A (in degrees).
Set up the two conditions: A + B = 90 and A = B + 30.
Find the measure of angle A (in degrees).
- A120
- B54
- C66
- D60
Show answer
Answer: D) 60
From A = B + 30 and A + B = 90: (B + 30) + B = 90, so 2B = 60, B = 30, and A = 60 deg.
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