The area of an equilateral triangle is cm². Its perimeter is –

It is given in the question that,

Area of an equilateral triangle = 36 cm²

We know that,

Area of an equilateral triangle =

36 =

(Side)² =

Side = 12 cm

∴ Perimeter of equilateral triangle = 3 × Side

= 3 × 12

= 36 cm

Hence, option (a) is correct