Posted by **Emily** on Tuesday, March 20, 2007 at 8:46am.

Whats the difference between an arc [of a circle]'s length and measure? And how do you find each of them?

The "measure" of an arc is the angle that it subtends from the center of the circle. Call that angle A.

The length of the arc is

2 pi R * [A/(2 pi)] = R*A, if A is in radians and R is the radius of the circle, or pi R*A/180, if A is measured in degrees.

Emily think of a pizza that has been cut into 8 equal pieces, and look at one of those pieces.

The arc measure would be the angle that your piece of pizza has as its point, in this case 45º

The arc length would be the length of the curved part of your pizza slice, in this case 1/8 the circumference of the pizza

(remember C=2*pi*r)

- math -
**jevari**, Monday, November 26, 2012 at 9:47pm
6.3

## Answer This Question

## Related Questions

- math - An angle of 1.8 radians at the center of the circle subtends an arc of ...
- geometry - Point C is the center of the circle. The measure of angle ACB is 15x...
- maths - an arc of a circle subtends a central angle of 5pi/6 radians.if the ...
- trigonometry - Find the length of the arc that subtends an angle of measure 70 ...
- algebra - The area of a circle is 78.5 square centimeters, and a subtending arc...
- Math - I think this will be the last one. Find the radius of circle C if the ...
- Geometry - The question is to find the measure of arc PQ in Circle A. The point ...
- math advanced functions - a) Determine the measure of the central angle that is ...
- apex geometry - Hannah constructed two similar circles as seen in the image ...
- Bobby - Find the length (in cm) of an arc of a circle with radius 12 cm if the ...

More Related Questions