Which of the following is a triangular prism?

image of triangular prism
image of cube
image of cylinder
octagonal prism

Which one ? is the answer and how to find this answer

Select the graph of the solution. click until the correct graph appears. |x| = 3

Abicycle training wheel has a radius of 3 inches. the bicycle wheel has a radius of 10 inches.approximately how much smaller, in square inches and rounded to the nearest hundredth, is the area of the training wheel than the area of the regular wheel? *