Question

Calculate the center angle a if the lenght of the circular arc 31,4cm and the radius of the circle 9cm​

Answer 1

3.48 radian

Explanation:

length of arc= radius * center angle

31.4 = 9 * angle

angle is in radian

Answer 2

3.49 radians

Explanation:

The arc length formula is s = rФ, where r is the radius and Ф is the central angle. We know s and r and need to calculate Ф.

From s = rФ we get Ф = central angle = s/r

Here, that central angle Ф is (31.4 cm) / 9 cm = 3.49 radians