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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
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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 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.
How do you find the length of a sector?
The answer depends on what information you do have: radius, arc length, central angle etc.
