30 POINTS Name the three-dimensional figure shown in the picture.
A three dimensional figure with a regular four sided polygon as the base and four sides made up of three sided polygons is shown.
A. triangular prism
B. square prism
C. square pyramid
D. cone

A:triangular prism?!!

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