Answers

2014-04-18T13:30:06+05:30
The height of triangle is 6cm
then base length is found by pythagoras theorem
 a^{2}= ( \frac{a}{2} )^{2}+ h^{2}
 \frac{3a^2}{4}=36
 a^{2}=48
a= \sqrt{48}
The area of the triangle
= \frac{1}{2}ah =3 \sqrt{48}=20.7846 cm^2


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2014-04-18T15:36:30+05:30
Height of equilateral triangle is  √3/2 X a, where 'a' is the side of the equilateral triangle. So √3/2 x a = 6.  
Hence a = 12/√3.
   Area of an equilateral triangle is 1/2  base x height
ie   1/2 x 12 ÷ √3  x 6  =  36 ÷√3
  =  12√3.
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