Question

find the area of equilateral triangle if side is 3.5 cm​

Answer 1

Step-by-step explanation:

perimeter= sum of all sides

3.5 + 3.5 + 3.5

3× 3.5

3 × 3/10

3×35

____

10

ans - 105

Answer 2

Answer:

Step-by-step explanation:

side=3.5+3.5+3.5

now s=3.5+3.5+3.5

s=5.25

so a=root s*s-a*s-b*s-c

=root 5.25*1.75*1.75*1.75

=28.13671875

therefor the are of the equilateral triangle is 28.13671875