Question

Which expression gives the length of AB if the circumference of the circle is38 cm?145B145A.38B.360145· 387c.36038D.145360387

Answer 1

Remember that the formula for the length of the arc is:

`2\pi r\cdot(\theta)/(360)`

Notice that

`2\pi r`

is the formula for the circumference of the circle.

Using this and the data given, we'll have:

`2\pi r\cdot(\theta)/(360)\rightarrow38\cdot(145)/(360)`

Or

`(145)/(360)\cdot38`

Therefore, the correct answer is Option A