Question

Find the area of an equilateral triangle whose one side is 3cm.​

Answer 1

Step-by-step explanation:

Area of equilateral triangle=

= (√3/4) * a²

= (√3/4) * 3²

= (√3/4) *9

= (9√3)/4

Answer 2

Answer:

S = 3+3+3/2 = 4.5

Area = √s(s-a)(s-b)(s-c)

= √4.5(4.5-3)(4.5-3)(4.5-3)

= √4.5×3.375

= √15.1875

= 3.90 cm^2

Hope this helps you