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a²+(a+b)²=(a+2b)²
a²+a²+2ab+b²=a²+4ab+4b²
2a²+2ab+b²=a²+4ab+4b²
a²-2ab-3b²=0
(a+b)(a-3b)=0
a=-b atau a=3b
a+2b=30
3b+2b=30
5b=30
b=6
a=30-2b=30-12=18
L=a.t/2
=a.(a+b)/2
=18(18+6)/2
=9.24=216