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180=2x + 2x + 3x + 3x
180=10x
18=x
18 × 2 = 36
hasilnya 36°
20 - 10 = 10
10 : 2 = 5
t = 13 pangkat 2 - 5 pangkat 2
= akar 169 - 25
= akar 144
t = 12 cm
L = 30 x 12 / 2
= 180 cm pangkat 2