luas segitiga = 1/2 x a x t
108 = 1/2 x 18 x t
108 = 9 x t
t. = 108/9
t. = 12
6² = 9² - a²
36 = 81 - a²
a² = 81 - 36
a² = 45
a. = 6,7
keliling = a + b + c
= 12 + 18 + 6,7
= 36,7 cm
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luas segitiga = 1/2 x a x t
108 = 1/2 x 18 x t
108 = 9 x t
t. = 108/9
t. = 12
6² = 9² - a²
36 = 81 - a²
a² = 81 - 36
a² = 45
a. = 6,7
keliling = a + b + c
= 12 + 18 + 6,7
= 36,7 cm