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= akar 10^2 - 6^2
= akar 100 - 36
= akar 64
= 8 cm
luas = 2.la + kll alas. t
= 2 ( 7+13. 8 : 2 ) + (13+10+7+8).20
= 2 (80) + 38 (20)
= 160 + 760
= 920 cm^2