Use the formula (A=frac{1}{2}bh)
Solve for altitude: (h=frac{2A}{b})
Identify the base (b) of the triangle
Find the area (A) of the triangle
Substitute (A) and (b) into (h=frac{2A}{b})
Calculate the altitude (h)
For an equilateral triangle, use (h=frac{sqrt{3}}{2}s)
For a right triangle, use one leg as the altitude to the other leg
For an isosceles triangle, split it into two right triangles and use the Pythagorean theorem
For any triangle, draw a perpendicular from a vertex to the opposite side
The perpendicular segment is the altitude