Question

Find distance between $(2,\frac{\pi }{4})\&(-2,\frac{5\pi }{6})$

Answer 1

$A(2,\frac{\pi }{4})$ & $B(-2,\frac{5\pi }{6})$

AB=$\sqrt{{(2+2)}^2+{(\frac{\pi }{4}-\frac{5\pi }{6})}^2}=\sqrt{16+\frac{49{\pi }^2}{144}}$