Question Paper
Class / Subject: Class 9 (ICSE) · Mathematics
Chapter: Chapter 15 — Chapter 15: Construction of Polygons
Time Allowed: 32 minutes
Max Marks: 16
1. What formula finds a regular polygon's central angle? [1]
(A) 360°/n
(B) 180°/n
(C) 90°/n
(D) n/360°
2. What is the central angle of a regular hexagon (n=6)? [1]
(A) 60°
(B) 90°
(C) 120°
(D) 180°
3. What tool measures angles for construction? [1]
(A) A protractor
(B) A ruler only
(C) A compass only
(D) A calculator
4. What tool draws accurate straight lines? [1]
(A) A ruler
(B) A protractor only
(C) A compass only
(D) A calculator
5. What tool draws arcs and equal distances? [1]
(A) A compass
(B) A ruler only
(C) A protractor only
(D) A calculator
6. What do irregular polygons need for construction? [1]
(A) Enough given measurements
(B) No measurements needed
(C) Only one measurement
(D) Random guessing
7. What does practising construction build? [1]
(A) Precision and geometric understanding
(B) Confusion only
(C) No useful skill
(D) Only artistic ability
8. Why is polygon construction an important skill? [1]
(A) It builds precision and understanding
(B) No reason
(C) It's not useful
(D) Only for tests
9. What formula finds a regular polygon's central angle? [1]
(A) 360°/n
(B) 180°/n
(C) 90°/n
(D) n/360°
10. What is the central angle of a regular hexagon (n=6)? [1]
(A) 60°
(B) 90°
(C) 120°
(D) 180°
11. What tool measures angles for construction? [1]
(A) A protractor
(B) A ruler only
(C) A compass only
(D) A calculator
12. What tool draws accurate straight lines? [1]
(A) A ruler
(B) A protractor only
(C) A compass only
(D) A calculator
13. What tool draws arcs and equal distances? [1]
(A) A compass
(B) A ruler only
(C) A protractor only
(D) A calculator
14. What do irregular polygons need for construction? [1]
(A) Enough given measurements
(B) No measurements needed
(C) Only one measurement
(D) Random guessing
15. What does practising construction build? [1]
(A) Precision and geometric understanding
(B) Confusion only
(C) No useful skill
(D) Only artistic ability
16. Why is polygon construction an important skill? [1]
(A) It builds precision and understanding
(B) No reason
(C) It's not useful
(D) Only for tests