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Q.

Find the area of an equilateral triangle of side “a” using heron’s formula.


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a

3a22sq. units

b

3a24sq. units

c

5a24sq. units

d

3a25sq. units 

answer is B.

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Detailed Solution

Heron's formula→Area=ss-as-bs-c s=semi-perimeter, (a,b,c)=sides
s=a+a+a2=3a2
Area=3a23a2-a3a2-a3a2-a
=3a2a2a2a2
=3a24sq. units.
 
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