CAT Exam Numerical Ability Geometry

The size of an equilateral triangle is 10cm long. by drawing parallel to all its sides the distance b/w the any two parallel lines being the same. the triangle is divided into smaller equilateral triangle each of which has side of 1cm length. how many such triangles ate formed?

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100

Since the side of equilateral triangle is 10 cm 9 parallel lines are drawn corresponding to each side of triangle.

Number of smaller equilateral triangles formed = 1+3+5+...(2n-1)
where n = 10
and sum = n^2

ie, Number of triangles formed = n^2
= 10^2
=100
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MY ANSWER IS 10
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300 triangles are formed.
9 years agoHelpfull: Yes(0) No(0)

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