Answer:
Given that the equation of a circle is :

It's a half of an equilateral triangle because their angles measure 30° and 60° (an equilateral triangle has 3 angles of 60°)
So x=(2h/√3)/2=h√3=27√3≈15.6
-4x+7x-14
3x-14>-18
3x>-4
X>-4/3
3520:20 should be correct
4,550 is the answer when you multiply the two numbers together.