# SOLUTION: the perimeter of an equilateral triangle is 39 cm. find the length of an altitude of the triangle

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 Geometry: Triangles Solvers Lessons Answers archive Quiz In Depth

 Click here to see ALL problems on Triangles Question 542076: the perimeter of an equilateral triangle is 39 cm. find the length of an altitude of the triangleAnswer by stanbon(57222)   (Show Source): You can put this solution on YOUR website!the perimeter of an equilateral triangle is 39 cm. find the length of an altitude of the triangle --------- Draw a picture of an equilateral triangle. Draw an altitude (which is a perpendicular bisector of the base). --------- Use Pythagoras to find the altitude: h^2 + (39/2)^2 = 39^2 --- h^2 = (3/4)39^2 --- h = (39/2)sqrt(3) cm ======================== Cheers, Stan H. ========================