a circle has a circumstance of 20. it has an arc on length 4. what is the central angle of the arc in degrees?

∠72°.

Step-by-step explanation:

If a circle has a circumference of 20 and an arc with a length of 4, we can simply set up a ratio to determine the angle of the arc in degrees:

Cross multiply:

Divide both sides by '20':

x = 72°.

Therefore, the measure of the central angle of the arc is ∠72°.

it would open into a square depending on the type of envelope i’m not sure about the second part