Anna is determining the length of arc ED by using the ratio

Answer 1

of the central angle to the total angle in the circle.

To find the length of arc ED using this method, Anna needs to follow these steps:

1. Measure the central angle of arc ED, let's call this angle θ.

2. Measure the total angle of the circle, which is 360 degrees.

3. Calculate the ratio of the central angle θ to the total angle of the circle (θ/360).

4. Multiply this ratio by the circumference of the circle to find the length of arc ED.

The formula for finding the length of arc ED is:
Length of arc ED = (θ/360) * Circumference

Anna can use this method to accurately determine the length of arc ED by using the central angle and the total angle of the circle.