if you do a quick calculation on what that angle is, you'll notice that it is exactly 1 radian, and an angle of 1 radian, has an arc that is the same length as its radius.
that's pretty much what one-radian stands for, an angle, whose arc is the same length as its radius.
Answer:
Wave speed is the distance that a wave travels in a given amount of time. Wave speed is related to wave length and wave frequency. Wave frequency can be found by using the formula Speed=wavelength × frequency
Step-by-step explanation:
Let the set of all Odd multiples of 9 between 2 and 82 be denoted by D, then, using set-builder notation,
The odd multiples of 9, 
, in the range 
form the set
Each member of the set is a term of the arithmetic progression
where the values of 
range from 0 to 4, or 
Putting these facts together, we get the result
Learn more about set-builder notation here: brainly.com/question/17238769
