tolong bantu dong cara nya gimana??

luas = a × t × 1/2
120 = 12x × 5x ÷ 2
60× = 120 × 2
60× = 240
x = 240/60
x = 3

12x = 12.3 = 36
5x = 5.3 = 15
9x + 8 = 9.3 + 8 = 27 + 8 = 35

keliling = s + s + s
keliling = 36 + 15 + 35
keliling = 86

maaf kalo salah

Luas = a x t :2
120 = 12x . 5x : 2
60 = 60 x^2
X^2= 1
X = 1

K = 5x + 12x + 9x + 8
= 26x + 8
= 26(1) + 8
=26 + 8
= 34

Semoga membantu