Trapezoid - construction

Construct a trapezoid KLMN, where: k = 9 cm, l = 4 cm, m = 5 cm and angle α = 45°

Result

n = (Correct answer is: ?)

Step-by-step explanation:

$$\begin{gathered} 1.KL=k=9\text{ cm } \\ 2.\mathrm{\angle }YKL=45\mathrm{°} \\ 3,k(L,r=4cm) \\ 4.X;X\in KL;\mathrm{\mid }KX\mathrm{\mid }=m=5cm \\ 5.q;q\mathrm{\mid }\mathrm{\mid }YK;X\in q \\ 6.M;M=q\cap k \\ 7.w;w\mathrm{\mid }\mathrm{\mid }KL;M\in w \\ 8.N;N=q\cap YK \\ 9.KLMN \\ n=? \end{gathered}$$

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