The radius of a circle is 4 miles. What is the length of a 45° arc? 45°
r=4 mi
Give the exact answer in simplest form.

2π miles

Step-by-step explanation:

2πr is the formula for the circumference of a circle.

Using that formula, the circumference for this circle is 8π.

Since the circle's full angle is 360°, we can use a ratio to find out how long the 45° arc is.

  °    : length

360  :   8π

 9     :  0.4π

45    :  2π

The 45° is 2π mi long.

yes

step-by-step explanation:

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