[tex]l = \frac{a + b}{2} \\ a + b = 2l \\ a = 2l - b \\ a = 2 \times 15 - 18 = 30 - 18 = 12[/tex]
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[tex]l = \frac{a + b}{2} \\ a + b = 2l \\ a = 2l - b \\ a = 2 \times 15 - 18 = 30 - 18 = 12[/tex]