1. Two triangles are similar if their corresponding:
A. Sides are equal
B. Angles are equal and sides are proportional
C. Areas are equal
D. Perimeters are equal

2. The symbol used for similarity of triangles is:
A. ≅
B. =
C. ∼
D. ⊥

3. If two angles of one triangle are equal to two angles of another triangle, then triangles are similar by:
A. SSS
B. SAS
C. AA
D. RHS

4. In similar triangles, corresponding sides are:
A. Equal
B. Proportional
C. Parallel
D. Perpendicular

5. The sum of angles in a triangle is:
A. 90°
B. 180°
C. 270°
D. 360°

6. Which similarity criterion uses three proportional sides?
A. AA
B. SAS
C. SSS
D. RHS

7. If AB/DE = BC/EF = AC/DF, then:
A. Triangles are congruent
B. Triangles are similar
C. Triangles are right-angled
D. None

8. The Basic Proportionality Theorem is also called:
A. Euclid's Theorem
B. Pythagoras Theorem
C. Thales Theorem
D. Apollonius Theorem

9. A line parallel to one side of a triangle divides the other two sides:
A. Equally
B. In same ratio
C. At right angles
D. Randomly

10. The converse of BPT is used to prove:
A. Congruency
B. Similarity
C. Parallel lines
D. Area

11. If DE ∥ BC in ΔABC, then:
A. AD/AB = AE/AC
B. AD = AE
C. AB = AC
D. None

12. The ratio of areas of two similar triangles is equal to:
A. Ratio of corresponding sides
B. Square of ratio of corresponding sides
C. Cube of ratio of corresponding sides
D. Product of corresponding sides

13. If side ratio of two similar triangles is 2:3, then area ratio is:
A. 2:3
B. 3:2
C. 4:9
D. 8:27

14. If area ratio of two similar triangles is 25:49, side ratio is:
A. 25:49
B. 5:7
C. 7:5
D. 10:14

15. Pythagoras theorem applies to:
A. Any triangle
B. Equilateral triangle
C. Right triangle
D. Isosceles triangle

16. In a right triangle:

A. a + b = c
B. a² + b² = c²
C. a² − b² = c²
D. ab = c

17. In a right triangle, the longest side is:
A. Base
B. Perpendicular
C. Hypotenuse
D. Median

18. If sides are 3 cm, 4 cm, and 5 cm, the triangle is:
A. Acute angled
B. Obtuse angled
C. Right angled
D. Equilateral

19. The converse of Pythagoras theorem helps determine:
A. Area
B. Similarity
C. Right triangle
D. Perimeter

20. If 5² + 12² = 13², the triangle is:
A. Equilateral
B. Isosceles
C. Right angled
D. Obtuse