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You also need the radius.
In degrees:
A full circle has 360o and a circumference of 2{pi}r. If you know the arc length, you can work out the fraction of the circumference this represents (divide arc_length by 2{pi}r) and multiply this by 360o to get the angle in degrees.
In radians:
A full circle has 2{pi} radians; using radians arc_length = angle x radius. So given an arc_length, divide by the radius to get the angle in radians.
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How can you find the length of arc when central angle is not given?
The answer will depend on what other information is given.
How do you find a chord length with the central angle and radius given?
If the radius is 8cm and the central angle is 70, how do yu workout the chord lenght?
How do you find the arc length when the central angle is given?
Well, in degrees, the arc is congruent to its central angle. If the radius is given, however, just find the circumference of the circle (C=πd). Then, take the measure of the central angle, and divide that by 360 degrees. Multiply the circumference by the dividend, and you will get the arc length. This works because it is a proportion. Circumference:Arc length::Total degrees in triangle:Arc's central angle. Hope that helped. :D
How do you find the chord length with the central angle and radius?
If the central angle is 70 and the radius is 8cm, how do you find out the chord lenght?
How do you find arc length when given radius and chord?
You can use the cosine rule and the three lengths of the triangle to find the central angle X, (in radians). Then the length of the arc is r*X units.
