construct a 30 60 90 triangle30 60 90 triangle relationship30 60 90 triangle proportions30 60 90 triangle dimensionstrigonometry 30 60 90 trianglesspecial triangles 30 60 9030 60 90 triangle equationgeometry 30 60 90 triangle30 60 90 triangle formula30 60 90 triangle hypotenuse30 60 90 triangle side lengths30 60 90 degree triangle