sin 30° =

A circle has a radius of 7 cm. Find the length of an arc for a central angle of π∕3 rad.

Find the value of the angle c° in the right-angled triangle shown in the figure.

If $$\sin\Theta\ =\ \frac{3}{5}\ and\ \cos\Theta\ =\frac{4}{5},\ find\ \tan\Theta.$$