Question 84023
AD being the bottom base
BC being the top base
{{{(1/2)(h)(base1 + base2)}}}
{{{(1/2)(h)(8 + 10)}}}
{{{(1/2)(h)(18)}}}
{{{9h}}}
What is the height? ....
You can make a 30-60-90 triangle using angle A and angle B.
Opposite the 30 degree angle is 1 unit long.
Opposite the 60 degree angle (height) should be {{{sqrt(3)}}} units long.
~ Using 30-60-90 rule ~ 
{{{9*sqrt(3)}}}