Arc cd is 2/3 of the circumference of a circle. what is the radian measure of the central angle?
2(pie)/3 radians
3(pie)/4 radians
4(pie)/3 radians
3(pie)/2 radians

The measures of the angles in △abc are given by the expressions in the table. angle measure angle a 65° angle b (3x−10)° angle c (2x)∘ find the value of x. then find the m∠b and m∠c.