Question

find the length of a side of an equilateral triangle whose perimeter is 3 metre 12 centimetre

Answer 1

given,
the perimeter of the triangle = 3 m 12 cm
                                         = 3*100+12
                                         = 300+12
                                         = 312 cm
therefore length of each side,
⇒ a+a+a = perimeter
⇒ 3a = 312
⇒ a = 312/3
⇒ a = 104
∴ the length of each side is 104 cm
                i hope that this will help u.........................^_^ 

Answer 2

In equilateral triangle, the length of all sides are same
Let the length of sides = x

Perimeter = x+x+x = 3x
given that perimeter = 3m 12 cm 
3m 12cm = 3×100 + 12 = 312cm

thus 3x = 312cm
⇒ x = 312/3
⇒ x = 104cm = 1m 4cm

length of side is 1m 4cm