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K = x + x + x - 2
K = 3x - 2 cm
B. 13 = 3x - 2
13 + 2 = 3x
15 = 3x
x = 5
Sisinya 5 cm , 5 cm , 3 cm
kliling = x + x + x -2
= 3x - 2
jawaban soal B
kliling = 3x - 2
13 = 3x - 2
13+ 2 = 3x
15 = 3x
15/3 = x
5 = x
sisi mirng = x = 5 cm
sisi bawah = x - 2 = 5 - 2 = 3 cm