Question

Perimeter of equilateral triangle 18 cm find the length of its median

Answer 1

$perimeter = 3a$
18=3a; a=6cm.
$median \: divides \: the \: side \: in \: the \: same \: prportion$
In ∆ABC, AM is a median. AB=BC=AC=6cm ; so, BM=1/2×BC. BM=3cm.
$side \: opp \: to \: 60 = \sqrt{3} \: by \: 2 \times hypo$
AM=√3/2×6 ; AM =3√3 Cm