Use the formula (A = frac{1}{2}bh)
Solve for height: (h = frac{2A}{b})
Measure the base (b)
Find the triangle’s area (A)
Substitute the values into (h = frac{2A}{b})
Calculate the height
For an equilateral triangle, use (h = frac{sqrt{3}}{2}s)
For a right triangle, use the perpendicular leg as the height
If only side lengths are known, use Heron’s formula to find area first
If coordinates are known, use geometry or the distance formula to determine the altitude