Question

the height of an equilateral triangle whose perimeter is 63 cm is

Answer 1

the height is 18.18 cm

Answer 2

$side \: length = \frac{63}{3} \\ height = \frac{ \sqrt{3} }{2} \times side \: length \\ \frac{ \sqrt{3} }{2} \times \frac{63}{3} = 18.18$