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خطا

$\ell =R{{\theta }_{1}}\Rightarrow \frac{3}{4}\pi =6{{\theta }_{1}}$ $\Rightarrow {{\theta }_{1}}=\frac{3}{24}\pi \Rightarrow {{\theta }_{1}}=\frac{\pi }{8}$ ${{\theta }_{1}}-{{\theta }_{2}}=\frac{\pi }{16}\Rightarrow {{\theta }_{2}}=\frac{\pi }{16}$ $\Rightarrow \frac{{{\theta }_{2}}}{180}=\frac{R}{\pi }\Rightarrow \frac{{{\theta }_{2}}}{180}=\frac{\frac{\pi }{16}}{\pi }$ $\Rightarrow {{\theta }_{2}}=\frac{180}{16}=\frac{45}{4}=11/25$