Bantu kak beserta caranya yang jelas

[tex]L1 = \frac{1}{2} at = \frac{1}{2} (8)(5+5+5) = 4(15) = 60 \ cm^{2} \\ \\ L2 = \frac{1}{2} at = \frac{1}{2} (8)(5+5) = 4(10) = 40 \ cm^2 \\ \\ Ltdk \ diarsir = \frac{1}{2} at = \frac{1}{2} (8)(5) = 4(5) = 20 \ cm^2 \\ \\ Ldiarsir = L1+L2-(2.Ltdk \ diarsir) \\ = 60+40-(2.20) \\ = 100-40 \\ = 60 \ cm^2 \\ \\ \\ \\ \\ semogamembantu:)[/tex]