Mental Maths Questions and Answers: Triangles and their Properties | Mental Math for Class 7 PDF Download

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2. What are the three sides of  ??????? .  
3. Name the three vertices of  ??????? .  
4. Name the equal sides in ??????? if ??? = ??? .  
5. What is the sum of interior angles of a triangle?  
6. What is the sum of exterior angles of a triangle?  
7. Name the angles which are equal in given figure of ??????? .   
 
8. The angle of a triangle are in 5 : 6 : 7. What is the measurement of 
smallest angle?  
9. The angles ??? , ??? are ??? of ??????? are in the ratio 1: 3 : 1. Which 
angle is obtuse angle and what is it’s measurement? 
10. The angles of a triangle are (?? - ???? )°, (?? - ???? )° and ?? °. Find the 
value of ?? .   
11. The point of concurrency of medians of a triangle is known as _____ 
12. From the given figure, find the value of ?? .  
 
13. The sum of two angles of a triangle is equal to its third angle. Find 
the third angle.  
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2. What are the three sides of  ??????? .  
3. Name the three vertices of  ??????? .  
4. Name the equal sides in ??????? if ??? = ??? .  
5. What is the sum of interior angles of a triangle?  
6. What is the sum of exterior angles of a triangle?  
7. Name the angles which are equal in given figure of ??????? .   
 
8. The angle of a triangle are in 5 : 6 : 7. What is the measurement of 
smallest angle?  
9. The angles ??? , ??? are ??? of ??????? are in the ratio 1: 3 : 1. Which 
angle is obtuse angle and what is it’s measurement? 
10. The angles of a triangle are (?? - ???? )°, (?? - ???? )° and ?? °. Find the 
value of ?? .   
11. The point of concurrency of medians of a triangle is known as _____ 
12. From the given figure, find the value of ?? .  
 
13. The sum of two angles of a triangle is equal to its third angle. Find 
the third angle.  
 
  
 
14. In a triangle one angle is thrice the smallest and another one is twice 
the smallest. Find the angles.  
15. Find the value of ‘y’ from the given figure-  
 
16. If one angle of a triangle in ???? ° and other two angles are in the ratio 
3 : 4, find these angles.  
17. From the given figure find the values of ‘a’ and ‘b’.  
 
18. The angles of a triangle are in ratio 3 : 5 : 7. Find the greatest angle.  
19. The angles of a triangle are (???? - ?? )°, (?? - ?? )°, and ?? °. Find the 
value of ?? and measurement of angles.  
20. Find ??????? from the given figure –  
 
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2. What are the three sides of  ??????? .  
3. Name the three vertices of  ??????? .  
4. Name the equal sides in ??????? if ??? = ??? .  
5. What is the sum of interior angles of a triangle?  
6. What is the sum of exterior angles of a triangle?  
7. Name the angles which are equal in given figure of ??????? .   
 
8. The angle of a triangle are in 5 : 6 : 7. What is the measurement of 
smallest angle?  
9. The angles ??? , ??? are ??? of ??????? are in the ratio 1: 3 : 1. Which 
angle is obtuse angle and what is it’s measurement? 
10. The angles of a triangle are (?? - ???? )°, (?? - ???? )° and ?? °. Find the 
value of ?? .   
11. The point of concurrency of medians of a triangle is known as _____ 
12. From the given figure, find the value of ?? .  
 
13. The sum of two angles of a triangle is equal to its third angle. Find 
the third angle.  
 
  
 
14. In a triangle one angle is thrice the smallest and another one is twice 
the smallest. Find the angles.  
15. Find the value of ‘y’ from the given figure-  
 
16. If one angle of a triangle in ???? ° and other two angles are in the ratio 
3 : 4, find these angles.  
17. From the given figure find the values of ‘a’ and ‘b’.  
 
18. The angles of a triangle are in ratio 3 : 5 : 7. Find the greatest angle.  
19. The angles of a triangle are (???? - ?? )°, (?? - ?? )°, and ?? °. Find the 
value of ?? and measurement of angles.  
20. Find ??????? from the given figure –  
 
 
  
 
21. What is the minimum and maximum integral value of length of third 
side of a triangle whose two sides are 7 cm and 10 cm.  
22. In the given figure ??????? = ???? ° and ??????? = ???? °, find ??????? and 
also name the type of triangle.  
 
23. In ??????? if ??? = ???? °, ??? = ???? °, ??? = ???? °, then which side is 
smallest?  
24. Find the value of ‘a’ from the given Fig.  
 
25. ??????? in an equilateral triangle and XP is the median, if ???? = ?? . ?? 
cm, find the perimeter of ??????? .  
26. From the given figure, find the value of ?? and ?? .  
 
Page 5


 
  
 
2. What are the three sides of  ??????? .  
3. Name the three vertices of  ??????? .  
4. Name the equal sides in ??????? if ??? = ??? .  
5. What is the sum of interior angles of a triangle?  
6. What is the sum of exterior angles of a triangle?  
7. Name the angles which are equal in given figure of ??????? .   
 
8. The angle of a triangle are in 5 : 6 : 7. What is the measurement of 
smallest angle?  
9. The angles ??? , ??? are ??? of ??????? are in the ratio 1: 3 : 1. Which 
angle is obtuse angle and what is it’s measurement? 
10. The angles of a triangle are (?? - ???? )°, (?? - ???? )° and ?? °. Find the 
value of ?? .   
11. The point of concurrency of medians of a triangle is known as _____ 
12. From the given figure, find the value of ?? .  
 
13. The sum of two angles of a triangle is equal to its third angle. Find 
the third angle.  
 
  
 
14. In a triangle one angle is thrice the smallest and another one is twice 
the smallest. Find the angles.  
15. Find the value of ‘y’ from the given figure-  
 
16. If one angle of a triangle in ???? ° and other two angles are in the ratio 
3 : 4, find these angles.  
17. From the given figure find the values of ‘a’ and ‘b’.  
 
18. The angles of a triangle are in ratio 3 : 5 : 7. Find the greatest angle.  
19. The angles of a triangle are (???? - ?? )°, (?? - ?? )°, and ?? °. Find the 
value of ?? and measurement of angles.  
20. Find ??????? from the given figure –  
 
 
  
 
21. What is the minimum and maximum integral value of length of third 
side of a triangle whose two sides are 7 cm and 10 cm.  
22. In the given figure ??????? = ???? ° and ??????? = ???? °, find ??????? and 
also name the type of triangle.  
 
23. In ??????? if ??? = ???? °, ??? = ???? °, ??? = ???? °, then which side is 
smallest?  
24. Find the value of ‘a’ from the given Fig.  
 
25. ??????? in an equilateral triangle and XP is the median, if ???? = ?? . ?? 
cm, find the perimeter of ??????? .  
26. From the given figure, find the value of ?? and ?? .  
 
 
  
 
27. In a right angle triangle LMN if ????
?? + ????
?? = ????
?? , then which 
angle of this triangle is ???? °.  
28. A man goes 10 m due east and then 24 m due north, find his distance 
from the starting point.  
29. A square is described on the hypotenuse of a right angled triangle 
whose other two sides are 12 cm and 5 cm. What is the area of the 
square so formed?  
30. Find the value of ?? , ?? ?????? ??  if ???? ? ???? in ??????? .  
 
31. Two acute angles of a right angled triangle are equal. Find these two 
angles.  
32. From the given figure, find the value of ?? and ?? .  
 
33. In ??????? if ?? ??? = ?? ??? = ?? ??? , find the angles.  
34. In ??????? ??? = ?????? °. PS bisects ??? and ???? ? ???? . Find ??? .  
35. If one angle of a triangle is ???? ° and other two angles are in the ratio 
2 : 3, Find these angles.