Arc cd is two-thirds of the circumference of a circle. what is the radian measure of the central angle? startfraction 2 pi over 3 endfraction radians startfraction 3 pi over 4 endfraction radians startfraction 4 pi over 3 endfraction radians startfraction 3 pi over 2 endfraction radians

Step-by-step explanation:

We are given that length of arc CD= of circuference of circle.

We have to find the radian measure of central angle.

We know that circumference of circle=

Arc length =

Let central angle measure =

Substitute the values in given formula

Radian measure=

central angle=

Hence, the radian measure of central angle=

56

step-by-step explanation:

i belive those are the ones that are under 90 degreese.