RRB NTPC Prelims Model Paper 2 with solutions

Question : 91 of 101

Marks: +1, -0

If the perimeter of an equilateral triangle is 57 cm, find its area.

Solution:

(3) Perimeter of an equilateral triangle = 57 cm
∴ Each side

= 57/3 19

cm
Now, area of equilateral triangle =

√3 /4(19)^2=√ 3/4× 361

=156.31 cm

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