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La = 180 cm²
V = 1/3 La . t
720 = 1/3180 . t
12 = t
Lsisitegak1 = a . t /2
= 18 . 15 /2
= 135 cm²
Lsisitegak2 = a. t /2
= 10 . 13 /2
= 65 cm²
Ls = 2 (Lsisitegak1 + sisitegak 2)
Ls = 2 (135 + 65)
Ls = 2 . 200
Ls = 400 cm²
720 = 1/3*18*10*t
t = 8
L sisi tegak ada 2 = 1. √109
2. √145