Part 2) Option A: 25
Part 3) Option C: 16
Part 4) Option D: 20
Part 5) pentagon
Step-by-step explanation:
we know that
The Euler's formula state that, the number of vertices, minus the number of edges, plus the number of faces, is equal to two
so
Part 2) we have
vertices: 11
Edges: 34
Faces: ?
substitute the values in the formula and solve for F
Adds 23 both sides
Part 3) we have
Edges: 36
Faces: 22
Vertices: ?
substitute the values in the formula and solve for V
Adds 14 both sides
Part 4) we have
Faces: 12
Vertices: 10
Edges: ?
substitute the values in the formula and solve for E
Subtract 22 both sides
Multiply by -1 both sides
Part 5) we know that
The cross section of the figure is a plane figure with five straight sides and five angles
therefore
The figure is a pentagon