Question

the area of an equilateral triangle is 173.2cm . find its perimeter

Answer 1

Area of an equilateral triangle = under root 3/4 ×side ^2 . Given area =173.2 cm so under root 3/4 ×side^2 = 173.2 From here we can clculate the side of an equilateral triangle . since all the sides of an equilateral triangle are equal therefore its perimeter will be 3 × side

Answer 2

Answer:

√3= 1.732

and formula = √3/4×a^2= area

now, √3 /4 × a^2 = 173.2

173.2 ×4 = a^2 ×1.732

173.2 × 4/1.732 = a^2

400 ( got by solution) = a^2

so √400 = a

a= 20