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sisi = (2x+5) cm
K = 87
maka :
K = sisi x 3
87 = (2x+5) x 3
87 = 6x + 15
6x = 87 - 15
x = 72/6
x = 12 cm
jadi nilai x = 12 cm
karena segitiganya sama sisi jadi,
K = 3 ( s )
87 = 3 (2x+5)
87 = 6x + 15
87 - 15 = 6x
72 = 6x
72 ÷ 6 = x
12 = x