Question 180741
Let the height of the glass = h. Using the sine function: Sin(a) = h/c where a = 60 degrees and c is the hypotenuse.
{{{sin(60) = h/20}}}
{{{h = 20*sin(60)}}}
{{{h = 20(0.866)}}}
{{{h = 17.32}}}cm
The glass is 17 cm. tall.