Q6.  find the number of triangles in the figure?

A) 6
B) 10
C) 11
D) 16 

View Answer and Solution 

Answer: (B)
Solution: Numbering and labeling the image as shown in figure

Method 1 (easy method)
1 + 2 + 3 + 4 = 10

Method 2
Manual counting:
Triangle ABC = 1
Triangle ACE  and AEB= 2,
Triangle ADC, AFB  and ADF = 3
Triangle ABD, ADE, AEF  and AFC = 4 Ud
total Triangle = 1 + 2 + 3 + 4 = 10

Q7. Find the number of triangles in the figure?

A) 20
B) 24
C) 21
D) 23

View Answer and Solution 

Answer: (C)
Solution:
Total number of triangle
=1 + 2 + 3 + 4 + 5 + 6
= 21

Q8. Find the number of triangles in the figure?

A) 20
B) 24
C) 21
D) 23

View Answer and Solution 

Answer: (C)
Solution:
Manual counting: 
Triangle ABC =1
Triangle ACE and AEB = 2
Triangle ADC, AFB and ADF = 3
Triangle ABD, ADE, AEF and AFC = 4
So, total Triangle
= (1+2+3+4) x 3
= 30

Method 2:
First, give the label As  shown in Figure in So,
Total Triangle=  (Addition of number) x height
= (1+2+3+4) x 3
= 30

Q9. Find the number of triangles in the figure?

A) 60
B) 64
C) 61
D) 63

View Answer and Solution 

Answer: (D)
Solution: 
First give the label As  shown in Figure in So,
Total Triangle=  (Addition of number) x height
= (1+2+3+4+5+6) x 3
= 63

Q10. Find the number of triangles in the figure?

A) 20
B) 18
C) 13
D) 22

View Answer and Solution 

Answer: (C)
Solution:
Total number of triangles
= (N x 2) - 5
= (9 x 2) - 5
=13
This formula is apply only for symmetrical figure

About the author

Hi,
I am Vaibhav Choudhary, Reasoning Teacher by Profession but Blogger by a passion. I would like to share my reasoning knowledge with students those are taking a preparation of government exam or competitive exam.