Please help pic included

In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?

What is the missing step in this proof ?

Someone answer asap for ! michele pushes a box d meters across a floor. she uses a force f, in newtons, to push the box. she pushes the box for t seconds. the formula p = fd/t calculates the power, p, in watts, that it takes for michele to complete the task. solve the formula for d.