What did the wright brothers invent and how did their previous experience as bicycle makers them make their revolutionary
invention?

Answer:

Wright brothers are first credited to building and flying world’s first airplane.

Explanation:

The Wright brothers, “Wilbur Wright” and “Orville Wright”, were into “bicycle” repair and manufacture business before they invented “airplane”. Their experience in bicycles proved to be valuable to develop airplane.

In 1903, the “Wright brothers” invented a technology by which using a “system of pulleys” a man could control an aircraft.  Then, two years later they built and flew the first practical airplane, in 1905. The name of their aircraft was the “Wright Flyer”. They always claimed that they have built a control system for an aircraft which could make it a safer way of transportation. They experienced that just a cyclist bends the bicycle left and right to ride and turn, an airplane could also be balanced in air.

254.34

step-by-step explanation:

the formula for area of a circle is given by

a = pi * r^2

a = pi * 9^2

a = 81*pi

using 3.14 as an approximation for pi

a = 3.14*81

a = 254.34

b) the confederacy had to pay all union war expenses.