Perpendicular 73574

The two lines of the triangle are perpendicular to each other and are 27 cm and 36 cm. Calculate the length of the sides of the triangle and the length of the third line.

Correct answer:

a =  30 cm
b =  51.264 cm
c =  43.2666 cm
t₃ =  45 cm

Step-by-step explanation:

$$\begin{gathered} t_1=27\text{cm} \\ {t}_2=36\text{cm} \\ {a}^2=(2/3\cdot t_1{)}^2+(2/3\cdot t_2{)}^2 \\ a=\sqrt{(2/3\cdot t_1{)}^2+(2/3\cdot t_2{)}^2}=\sqrt{(2/3\cdot 27{)}^2+(2/3\cdot 36{)}^2}=30\text{cm} \end{gathered}$$

$$\begin{gathered} (b/2{)}^2=(1/3\cdot t_1{)}^2+(2/3\cdot t_2{)}^2 \\ b=2\cdot \sqrt{(1/3\cdot t_1{)}^2+(2/3\cdot t_2{)}^2}=2\cdot \sqrt{(1/3\cdot 27{)}^2+(2/3\cdot 36{)}^2}=6\sqrt{73}=51.264\text{cm} \end{gathered}$$

$$\begin{gathered} (c/2{)}^2=(2/3\cdot t_1{)}^2+(1/3\cdot t_2{)}^2 \\ c=2\cdot \sqrt{(2/3\cdot t_1{)}^2+(1/3\cdot t_2{)}^2}=2\cdot \sqrt{(2/3\cdot 27{)}^2+(1/3\cdot 36{)}^2}=12\sqrt{13}=43.2666\text{cm} \end{gathered}$$

$t_3=\sqrt{2\cdot b^2+2\cdot c^2-a^2}/2=\sqrt{2\cdot 51.264^2+2\cdot 43.2666^2-30^2}/2=45\text{cm}$

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