30I also think there are 20 triangles! :-)
2 Big ones
2 x 3 Medium Size Ones
12 Small Ones
It is an old question to
a) find the number of triangles..
b) Also find the no of parallelograms
c) Alos the number of Rhombus..
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12 Answers
62I dont know the answer but I am getting 20.. whidch is way too less...
it is 12+6+2
Can you explain your answer?
1/\ In this triangle, there are nine (9) little
/_\ triangles. Then there are three (3)
/\ /\ triangles which are larger (containing 4 little ones)
/_\/_\ and one (1) largest (containing all 9).
/\ /\ /\
/_\/ \/_\ 9+3+1 = 13 triangles.
so two big triangles means 26 such triangles
i found a little formula for determining the number of triangles in such a arrangement
b = Number of triangles in the base
l = Number of little triangles
f = Next largest triangle (contains 4 small triangles)
n = Next largest triangle (contains 9 small triangles)
s = Next largest triangle (contains 16 small triangles)
T = Total number of triangles
b l f n s T
1 1 0 0 0 1
2 4 1 0 0 5
3 9 3 1 0 13
4 16 7 3 1 27
30
1I think
Triangles = 20
Parallelograms = 21
Rhombuses = 15
What's the ans.?
1Number of triangles 20
Number of parallelograms 21
number of rhombuses 17
21first count all small triangles , i.e.=12
Then count the triangles containing 4 small triangles
six corners so this type 6
Now count triangles containing 9 small triangles
this type = 2
so total triangles = 12 +6+2 =20
1357The number of triangles is 20
Think again about ur vertices argument.
