I really don't get what the top box is asking me what to do

Step-by-step explanation:

The circle has a circumference:

This the is arc of full length θ = 360°

Each degree of arc length is:

We have:

The arc length is:

The same arc is:

sine

step-by-step explanation:

80° is the measure of gh

step-by-step explanation:

circle f is congruent to circle j

we have two circle with center f and j.

both circles are congruent. the radius of the circle would be equal.

see the attachment for the circle.

we are given ∠efd ≅ ∠gjh

therefore, arc (ed) = arc (gh)     (∴ circle f is congruent to circle j)

but ∠dfe=80°=arc (ed)

therefore, arc (gh) = 80°

thus, 80° is the measure of gh