Solving for Geometry Word Problems

a. A certain wheel has a diameter of 98 inches. If that wheel travels for 108 revolutions, then.
Questions: How many years has it gone? (use 22/7 for pi)
b. A regular hexagon and an equilateral triangle are equal in area. The perimeter of the triangle is 36.
Question: How long is one side of the hexagon?
c. The base of a certain triangle is increased by 20% and the altitude to that base is decreased by 40%.
Question: By what percent is that area changed? Is It Increased or Decreased?

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