Question 113

If the height of an equilateral triangle is $$10\sqrt3$$ cm, the area is:

Solution

If side of an equilateral triangle is a,then hieght of that triangle$$=a√3/2$$.

so,$$a√3/2=10√3.$$

or,$$a=20.$$

area$$=(1/2)×(a√3/2)×a$$

$$=(1/2)×10√3×20.$$

$$=100√3.$$

Option D is correct choice.

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