Class 10 Maths MCQs on Pythagoras Theorem and Converse
CBSE Class 10 Mathematics – Chapter 6: Triangles
Title: Class 10 Maths MCQs on Pythagoras Theorem and Converse
Designed as per: Latest CBSE Board Examination Pattern (NCERT Based)
Q1. In a right-angled triangle, if base = 6 cm and height = 8 cm, the hypotenuse is:
Correct Answer: B. 10 cm
By Pythagoras theorem: Hyp² = 6² + 8² = 36 + 64 = 100
Hyp = √100 = 10 cm.
Q2. If sides of a triangle are 5 cm, 12 cm and 13 cm, the triangle is:
Correct Answer: C. Right-angled
5² + 12² = 25 + 144 = 169 = 13².
By Converse of Pythagoras theorem, triangle is right-angled.
Q3. If hypotenuse = 25 cm and one side = 7 cm, find the other side.
Correct Answer: A. 24 cm
Other side² = 25² − 7² = 625 − 49 = 576
Side = √576 = 24 cm.
Q4. Which set of sides forms a right-angled triangle?
Correct Answer: B. 8,15,17
8² + 15² = 64 + 225 = 289 = 17².
Q5. Diagonal of square with side 10 cm is:
Correct Answer: A. 10√2
Diagonal² = 10² + 10² = 200
Diagonal = √200 = 10√2.
Q6. A ladder 13 m long reaches 12 m up a wall. Distance from wall is:
Correct Answer: C. 5 m
Base² = 13² − 12² = 169 − 144 = 25
Base = 5 m.
Q7. If sides are 7,24,25 the triangle is:
Correct Answer: A
7²+24²=49+576=625=25².
Q8. Hypotenuse = 17, one side = 8. Other side?
Correct Answer: A
17²−8²=289−64=225 → 15.
Q9. If sides are 10,6,8 triangle is:
Correct Answer: C
6²+8²=36+64=100=10².
Q10. Diagonal of rectangle 9 cm by 12 cm:
Correct Answer: C
9²+12²=81+144=225 → 15.
Q11. If 9²+12² equals:
Correct Answer: B
81+144=225.
Q12. Triangle with sides 3,4,6 is:
Correct Answer: C
3²+4²=25 < 6²=36 → obtuse.
Q13. Largest side opposite right angle is called:
Correct Answer: B
In right triangle, longest side opposite 90° is hypotenuse.
Q14. If a² + b² = c² then angle opposite c is:
Correct Answer: B
Converse of Pythagoras theorem.
Q15. A 15m pole casts 8m shadow. Distance from tip to top?
Correct Answer: C
15²+8²=225+64=289 → 17.
Q16. Hyp² − Base² equals:
Correct Answer: A
Rearranged Pythagoras theorem.
Q17. 20² − 12² equals:
Correct Answer: A
400−144=256.
Q18. Triangle sides 9,40,41 is:
Correct Answer: A
9²+40²=81+1600=1681=41².
Q19. If diagonal of square is 14√2, side is:
Correct Answer: A
Diagonal=side√2 → side=14.
Q20. Converse of Pythagoras theorem is used to:
Correct Answer: B
If square of one side equals sum of squares of other two, triangle is right-angled.
