Question

Perimeter of a equilateral triangle us 30 cm
find its area by hown's formula​

Answer 1

Answer:

Step-by-step explanation:

we know that perimeter of triangle is sum of three sides.

and it is an equilateral triangle so all sides would be same let them be x cm

so,

x + x + x = 30

3 x = 30

x = 10  

now we know area of equilateral triangle is  A=3

4a

now the side is 10 cm,

then

   

area= 43.3  or 25√3  

Answer 2

Step-by-step explanation:

each side =10cm

Heron formula=(s-a)(s-b)(s-c)

s=30/2=15

area=(15-10)(15-10)(15-10)

=5x5x5

=125 sq cm

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