Answer:
An equilateral triangle with a perimeter = 30 has each side = 10.
The height of an equilateral triangle = side * sqr root (3) / 2 =
10 * 1.7320508076 / 2 = 17.320508076 / 2 = .866025...
http://www.1728.org/triang.htm
Step-by-step explanation:
