The height of a triangle sail can be found by using the area formula for triangles. This is done by taking the total area of the sail and dividing it by the base length of the triangle. The result is the height, which provides information about both how large and tall the sail is. This method is useful for determining both sail dimensions as well as estimating force on masts or poles when using triangular sails in sailing applications (citation).

The area formula for triangles involves multiplying half of its base lengths together with its height. In order to calculate this, one must first know either two side lengths/angles or two angles/side lengths; then they can use this information to calculate what their third side length will be and use that along with their known data to find out what their unknowns are (cit). For example, if you know two sides of a triangle you can use them and your knowledge of basic trigonometry to find out what angle C will be; from there you can solve for side A and B which makes up your base length. With all three pieces of information now available you have everything needed to solve for your missing values: Area = ½ x Base Length x Height.