a = 2√27
b = 10√27
h = 5√3
P = [tex]\frac{(a+b)*h}{2}[/tex]
P = [tex]\frac{(2\sqrt{27}+10\sqrt{27})*5\sqrt{3} }{2}=\frac{(6\sqrt{3}+30\sqrt{3} )*5\sqrt{3} }{2}=\frac{36\sqrt{3}*5\sqrt{3} }{2}=18*3*5=270[/tex]
