Find the area of an equilateral triangle having altitude h cm.
Let each side of equilateral triangle is a cm
Using pythagorous theorem in right ∆ADB
(AB)2 = (AD)2 + (BD)2
(
)2 = (
)2 + (
)2
= 
cm
Area of an equilateral triangle = 
= 
= 
= 
= 
cm2
7