SOLUTION: What is the length of an altitude of an equilateral triangle with a perimeter of 30 inches?

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Question 850610: What is the length of an altitude of an equilateral triangle with a perimeter of 30 inches?
Answer by Cromlix(4381) About Me  (Show Source):
You can put this solution on YOUR website!
An equilateral triangle has all sides equal.
If the perimeter = 30 inches, then the sides
all equal 10 inches.
An altitude from the top apex of the triangle
will cut the base of the triangle into 2 each
equalling 5 inches.
You then have a right angled triangle with a hypotenuse
= 10 inches and a side = 5 inches
The altitude^2 = 10^2 - 5^2
Altitude = square root of 75
Altitude = 8.7 inches (1 decimal place)
Hope this helps. :-)