Question Paper
Class / Subject: Class 9 (ICSE) · Mathematics
Chapter: Chapter 10 — Chapter 10: Isosceles Triangles
Time Allowed: 32 minutes
Max Marks: 16
1. How many equal sides does an isosceles triangle have? [1]
(A) Two
(B) Three
(C) One
(D) Zero
2. What are the equal sides called? [1]
(A) Legs
(B) Bases
(C) Hypotenuses
(D) Vertices
3. What is the angle between the legs called? [1]
(A) The vertex angle
(B) The base angle
(C) The right angle
(D) No specific name
4. What is true about base angles in an isosceles triangle? [1]
(A) They are equal
(B) They are always different
(C) They are always 90°
(D) They don't exist
5. What is the converse of this theorem? [1]
(A) Equal angles mean equal opposite sides
(B) Equal sides mean unequal angles
(C) Nothing is implied
(D) Only sides matter, not angles
6. Are all isosceles triangles equilateral? [1]
(A) No, not necessarily
(B) Yes, always
(C) Only sometimes, rarely
(D) Equilateral and isosceles are unrelated
7. What property is unique to isosceles triangles? [1]
(A) Base angles being equal
(B) All angles being equal
(C) No sides being equal
(D) All being right triangles
8. Why study isosceles triangle properties? [1]
(A) To solve geometry problems involving symmetry
(B) No reason
(C) It's not useful
(D) Only for tests
9. How many equal sides does an isosceles triangle have? [1]
(A) Two
(B) Three
(C) One
(D) Zero
10. What are the equal sides called? [1]
(A) Legs
(B) Bases
(C) Hypotenuses
(D) Vertices
11. What is the angle between the legs called? [1]
(A) The vertex angle
(B) The base angle
(C) The right angle
(D) No specific name
12. What is true about base angles in an isosceles triangle? [1]
(A) They are equal
(B) They are always different
(C) They are always 90°
(D) They don't exist
13. What is the converse of this theorem? [1]
(A) Equal angles mean equal opposite sides
(B) Equal sides mean unequal angles
(C) Nothing is implied
(D) Only sides matter, not angles
14. Are all isosceles triangles equilateral? [1]
(A) No, not necessarily
(B) Yes, always
(C) Only sometimes, rarely
(D) Equilateral and isosceles are unrelated
15. What property is unique to isosceles triangles? [1]
(A) Base angles being equal
(B) All angles being equal
(C) No sides being equal
(D) All being right triangles
16. Why study isosceles triangle properties? [1]
(A) To solve geometry problems involving symmetry
(B) No reason
(C) It's not useful
(D) Only for tests