Question

Radius=6.3cm and angle=40° find the length

Answer 1

$l = r \theta$

$⇒ \: l = 6.3 \times 90 \degree$

$⇒ \: l = 6.3 \times 0.6981$

$⇒ \: l = 4.39803$

$⇒ \: l = 4.4 \: \: cm . {rad}^{ - 1}$