Angles can be measured in units called radians. one radian is the measure of an angle that subtends an arc whose length is equal to the radius of the circle. by this definition, which statement is not true?

Step-by-step explanation:

The first one is true.

We can see this by converting the problem from radian to degree

The second one is true.

There is 180 degrees in a semi / half circle

(Answer) The third one is not true.

does not equal the arc

The length of an arc equals

s = length

r = radius

df =

both have same length