1. How many triangles exist in the adjoining figure?
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1. How many triangles exist in the adjoining figure?
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Answer:
Explanation : Indicate the parts in the triangle by
letters a, b, c, d, e as shown.
Triangles indicated by single letters are a, b, c, d, e=5
by two letters are a +b, b+d, d +c, c + a=4
by three letters is c+d+e=1
by four letters = 0
by five letters is a +b+c+d+e=1
Total 5 +4+1+0+1=11.
11
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