Question

Answer this question

Answer 1

I hope it helps mate

Answer 2

${ac}^{2} = {ab}^{2} + {bc}^{2} \\ {ac}^{2} = {2.5}^{2} + {6}^{2} \\ {ac}^{2} = 6.25 + 36 \\ ac = \sqrt{42.25} \\ ac = 6.5 \: dm \\ so \: total \: length = 6.5 + 2.5 = 9 \: dm$