1. the degree measure of an angle Ө is 240 degree. if the arc that subtends the angle Ө has a length of 8pi, then the radius of the circle is?

2. the smallest positive solution of the equation tan4A=-2,using radian measure is?

.....i arrived an answer of 0.4636....

3. for a circle of radius 15 cm, an arc length of 36 cm corresponds to a central angle of?

......i got an answer of 1.2pi rad....